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vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">hide</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">(Top)</div> </a> </li> <li id="toc-Ageing_versus_immortality" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Ageing_versus_immortality"> <div class="vector-toc-text"> 1 Ageing versus immortality </div> </a> <ul id="toc-Ageing_versus_immortality-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Symptoms" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Symptoms"> <div class="vector-toc-text"> 2 Symptoms </div> </a> <ul id="toc-Symptoms-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Biological_basis" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Biological_basis"> <div class="vector-toc-text"> 3 Biological basis </div> </a> <button aria-controls="toc-Biological_basis-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Biological basis subsection </button> <ul id="toc-Biological_basis-sublist" class="vector-toc-list"> <li id="toc-Molecular_and_cellular_hallmarks_of_ageing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Molecular_and_cellular_hallmarks_of_ageing"> <div class="vector-toc-text"> 3.1 Molecular and cellular hallmarks of ageing </div> </a> <ul id="toc-Molecular_and_cellular_hallmarks_of_ageing-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Metabolic_pathways_involved_in_ageing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Metabolic_pathways_involved_in_ageing"> <div class="vector-toc-text"> 3.2 Metabolic pathways involved in ageing </div> </a> <ul id="toc-Metabolic_pathways_involved_in_ageing-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Programmed_factors" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Programmed_factors"> <div class="vector-toc-text"> 3.3 Programmed factors </div> </a> <ul id="toc-Programmed_factors-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Evolution_of_ageing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Evolution_of_ageing"> <div class="vector-toc-text"> 3.4 Evolution of ageing </div> </a> <ul id="toc-Evolution_of_ageing-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Damage-related_factors" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Damage-related_factors"> <div class="vector-toc-text"> 3.5 Damage-related factors </div> </a> <ul id="toc-Damage-related_factors-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Research" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Research"> <div class="vector-toc-text"> 4 Research </div> </a> <button aria-controls="toc-Research-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Research subsection </button> <ul id="toc-Research-sublist" class="vector-toc-list"> <li id="toc-Diet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Diet"> <div class="vector-toc-text"> 4.1 Diet </div> </a> <ul id="toc-Diet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Exercise" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Exercise"> <div class="vector-toc-text"> 4.2 Exercise </div> </a> <ul id="toc-Exercise-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Social_factors" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Social_factors"> <div class="vector-toc-text"> 4.3 Social factors </div> </a> <ul id="toc-Social_factors-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Society_and_culture" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Society_and_culture"> <div class="vector-toc-text"> 5 Society and culture </div> </a> <button aria-controls="toc-Society_and_culture-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> Toggle Society and culture subsection </button> <ul id="toc-Society_and_culture-sublist" class="vector-toc-list"> <li id="toc-Economics" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Economics"> <div class="vector-toc-text"> 5.1 Economics </div> </a> <ul id="toc-Economics-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Sociology" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Sociology"> <div class="vector-toc-text"> 5.2 Sociology </div> </a> <ul id="toc-Sociology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Health_care_demand" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Health_care_demand"> <div class="vector-toc-text"> 5.3 Health care demand </div> </a> <ul id="toc-Health_care_demand-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Self-perception" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Self-perception"> <div class="vector-toc-text"> 5.4 Self-perception </div> </a> <ul id="toc-Self-perception-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Healthy_ageing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Healthy_ageing"> <div class="vector-toc-text"> 5.5 Healthy ageing </div> </a> <ul id="toc-Healthy_ageing-sublist" class="vector-toc-list"> <li id="toc-Intrinsic_capacity" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Intrinsic_capacity"> <div class="vector-toc-text"> 5.5.1 Intrinsic capacity </div> </a> <ul id="toc-Intrinsic_capacity-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Successful_aging" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Successful_aging"> <div class="vector-toc-text"> 5.6 Successful aging </div> </a> <ul id="toc-Successful_aging-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Cultural_references" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cultural_references"> <div class="vector-toc-text"> 5.7 Cultural references </div> </a> <ul id="toc-Cultural_references-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> 6 See also </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> 7 References </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Table of Contents" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" > Toggle the table of contents </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading">Ageing</h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 66 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-66" aria-hidden="true" > 66 languages </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af badge-Q17437796 badge-featuredarticle mw-list-item" title="featured article badge"><a href="https://af.wikipedia.org/wiki/Veroudering" title="Veroudering – Afrikaans" lang="af" hreflang="af" data-title="Veroudering" data-language-autonym="Afrikaans" data-language-local-name="Afrikaans" class="interlanguage-link-target">Afrikaans</a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B4%D9%8A%D8%AE%D9%88%D8%AE%D8%A9" title="شيخوخة – Arabic" lang="ar" hreflang="ar" data-title="شيخوخة" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target">العربية</a></li><li class="interlanguage-link interwiki-ast mw-list-item"><a href="https://ast.wikipedia.org/wiki/Avieyamientu_humanu" title="Avieyamientu humanu – Asturian" lang="ast" hreflang="ast" data-title="Avieyamientu humanu" data-language-autonym="Asturianu" data-language-local-name="Asturian" class="interlanguage-link-target">Asturianu</a></li><li class="interlanguage-link interwiki-bn mw-list-item"><a href="https://bn.wikipedia.org/wiki/%E0%A6%9C%E0%A6%B0%E0%A6%BE%E0%A6%97%E0%A7%8D%E0%A6%B0%E0%A6%B8%E0%A7%8D%E0%A6%A4%E0%A6%A4%E0%A6%BE" title="জরাগ্রস্ততা – Bangla" lang="bn" hreflang="bn" data-title="জরাগ্রস্ততা" data-language-autonym="বাংলা" data-language-local-name="Bangla" class="interlanguage-link-target">বাংলা</a></li><li class="interlanguage-link interwiki-bcl mw-list-item"><a href="https://bcl.wikipedia.org/wiki/Paggurang" title="Paggurang – Central Bikol" lang="bcl" hreflang="bcl" data-title="Paggurang" data-language-autonym="Bikol Central" data-language-local-name="Central Bikol" class="interlanguage-link-target">Bikol Central</a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A1%D1%82%D0%B0%D1%80%D0%B5%D0%B5%D0%BD%D0%B5" title="Стареене – Bulgarian" lang="bg" hreflang="bg" data-title="Стареене" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target">Български</a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Starenje" title="Starenje – Bosnian" lang="bs" hreflang="bs" data-title="Starenje" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target">Bosanski</a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Envelliment_hum%C3%A0" title="Envelliment humà – Catalan" lang="ca" hreflang="ca" data-title="Envelliment humà" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target">Català</a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/St%C3%A1rnut%C3%AD" title="Stárnutí – Czech" lang="cs" hreflang="cs" data-title="Stárnutí" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target">Čeština</a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Alderdom" title="Alderdom – Danish" lang="da" hreflang="da" data-title="Alderdom" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target">Dansk</a></li><li class="interlanguage-link interwiki-de badge-Q17437796 badge-featuredarticle mw-list-item" title="featured article badge"><a href="https://de.wikipedia.org/wiki/Altern" title="Altern – German" lang="de" hreflang="de" data-title="Altern" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target">Deutsch</a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Vananemine" title="Vananemine – Estonian" lang="et" hreflang="et" data-title="Vananemine" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target">Eesti</a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Envejecimiento_humano" title="Envejecimiento humano – Spanish" lang="es" hreflang="es" data-title="Envejecimiento humano" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target">Español</a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Maljuni%C4%9Do" title="Maljuniĝo – Esperanto" lang="eo" hreflang="eo" data-title="Maljuniĝo" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target">Esperanto</a></li><li class="interlanguage-link interwiki-ext mw-list-item"><a href="https://ext.wikipedia.org/wiki/Envejecimientu" title="Envejecimientu – Extremaduran" lang="ext" hreflang="ext" data-title="Envejecimientu" data-language-autonym="Estremeñu" data-language-local-name="Extremaduran" class="interlanguage-link-target">Estremeñu</a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Giza_zahartze" title="Giza zahartze – Basque" lang="eu" hreflang="eu" data-title="Giza zahartze" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target">Euskara</a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%B3%D8%A7%D9%84%D8%AE%D9%88%D8%B1%D8%AF%DA%AF%DB%8C" title="سالخوردگی – Persian" lang="fa" hreflang="fa" data-title="سالخوردگی" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target">فارسی</a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Vieillissement" title="Vieillissement – French" lang="fr" hreflang="fr" data-title="Vieillissement" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target">Français</a></li><li class="interlanguage-link interwiki-fy mw-list-item"><a href="https://fy.wikipedia.org/wiki/Fer%C3%A2ldering" title="Ferâldering – Western Frisian" lang="fy" hreflang="fy" data-title="Ferâldering" data-language-autonym="Frysk" data-language-local-name="Western Frisian" class="interlanguage-link-target">Frysk</a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Aos%C3%BA" title="Aosú – Irish" lang="ga" hreflang="ga" data-title="Aosú" data-language-autonym="Gaeilge" data-language-local-name="Irish" class="interlanguage-link-target">Gaeilge</a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Envellecemento_humano" title="Envellecemento humano – Galician" lang="gl" hreflang="gl" data-title="Envellecemento humano" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target">Galego</a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EB%85%B8%ED%99%94" title="노화 – Korean" lang="ko" hreflang="ko" data-title="노화" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target">한국어</a></li><li class="interlanguage-link interwiki-ha mw-list-item"><a href="https://ha.wikipedia.org/wiki/Ageing" title="Ageing – Hausa" lang="ha" hreflang="ha" data-title="Ageing" data-language-autonym="Hausa" data-language-local-name="Hausa" class="interlanguage-link-target">Hausa</a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BE%D5%A5%D6%80%D5%A1%D6%81%D5%B4%D5%A1%D5%B6_%D5%A3%D5%B8%D6%80%D5%AE%D5%A8%D5%B6%D5%A9%D5%A1%D6%81" title="Ծերացման գործընթաց – Armenian" lang="hy" hreflang="hy" data-title="Ծերացման գործընթաց" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target">Հայերեն</a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%86%E0%A4%AF%E0%A5%81%E0%A4%B5%E0%A5%83%E0%A4%A6%E0%A5%8D%E0%A4%A7%E0%A4%BF" title="आयुवृद्धि – Hindi" lang="hi" hreflang="hi" data-title="आयुवृद्धि" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target">हिन्दी</a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Penuaan" title="Penuaan – Indonesian" lang="id" hreflang="id" data-title="Penuaan" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target">Bahasa Indonesia</a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Invecchiamento" title="Invecchiamento – Italian" lang="it" hreflang="it" data-title="Invecchiamento" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target">Italiano</a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%94%D7%96%D7%93%D7%A7%D7%A0%D7%95%D7%AA" title="הזדקנות – Hebrew" lang="he" hreflang="he" data-title="הזדקנות" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target">עברית</a></li><li class="interlanguage-link interwiki-kn mw-list-item"><a href="https://kn.wikipedia.org/wiki/%E0%B2%B5%E0%B2%AF%E0%B2%B8%E0%B3%8D%E0%B2%B8%E0%B2%BE%E0%B2%97%E0%B3%81%E0%B2%B5%E0%B2%BF%E0%B2%95%E0%B3%86" title="ವಯಸ್ಸಾಗುವಿಕೆ – Kannada" lang="kn" hreflang="kn" data-title="ವಯಸ್ಸಾಗುವಿಕೆ" data-language-autonym="ಕನ್ನಡ" data-language-local-name="Kannada" class="interlanguage-link-target">ಕನ್ನಡ</a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D2%9A%D0%B0%D1%80%D1%82%D0%B0%D1%8E" title="Қартаю – Kazakh" lang="kk" hreflang="kk" data-title="Қартаю" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target">Қазақша</a></li><li class="interlanguage-link interwiki-sw mw-list-item"><a href="https://sw.wikipedia.org/wiki/Umri" title="Umri – Swahili" lang="sw" hreflang="sw" data-title="Umri" data-language-autonym="Kiswahili" data-language-local-name="Swahili" class="interlanguage-link-target">Kiswahili</a></li><li class="interlanguage-link interwiki-ht mw-list-item"><a href="https://ht.wikipedia.org/wiki/Vy%C3%A9yisman" title="Vyéyisman – Haitian Creole" lang="ht" hreflang="ht" data-title="Vyéyisman" data-language-autonym="Kreyòl ayisyen" data-language-local-name="Haitian Creole" class="interlanguage-link-target">Kreyòl ayisyen</a></li><li class="interlanguage-link interwiki-gcr mw-list-item"><a href="https://gcr.wikipedia.org/wiki/Vy%C3%A9yisman" title="Vyéyisman – Guianan Creole" lang="gcr" hreflang="gcr" data-title="Vyéyisman" data-language-autonym="Kriyòl gwiyannen" data-language-local-name="Guianan Creole" class="interlanguage-link-target">Kriyòl gwiyannen</a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/P%C3%AErb%C3%BBn" title="Pîrbûn – Kurdish" lang="ku" hreflang="ku" data-title="Pîrbûn" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target">Kurdî</a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%9A%D0%B0%D1%80%D1%82%D0%B0%D1%8E%D1%83" title="Картаюу – Kyrgyz" lang="ky" hreflang="ky" data-title="Картаюу" data-language-autonym="Кыргызча" data-language-local-name="Kyrgyz" class="interlanguage-link-target">Кыргызча</a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Noveco%C5%A1ana" title="Novecošana – Latvian" lang="lv" hreflang="lv" data-title="Novecošana" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target">Latviešu</a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Sen%C4%97jimas" title="Senėjimas – Lithuanian" lang="lt" hreflang="lt" data-title="Senėjimas" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target">Lietuvių</a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%A1%D1%82%D0%B0%D1%80%D0%B5%D0%B5%D1%9A%D0%B5" title="Стареење – Macedonian" lang="mk" hreflang="mk" data-title="Стареење" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target">Македонски</a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Penuaan" title="Penuaan – Malay" lang="ms" hreflang="ms" data-title="Penuaan" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target">Bahasa Melayu</a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Veroudering_(mens)" title="Veroudering (mens) – Dutch" lang="nl" hreflang="nl" data-title="Veroudering (mens)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target">Nederlands</a></li><li class="interlanguage-link interwiki-ne mw-list-item"><a href="https://ne.wikipedia.org/wiki/%E0%A4%AC%E0%A5%81%E0%A4%A2%E0%A5%8D%E0%A4%AF%E0%A5%8C%E0%A4%B2%E0%A5%80" title="बुढ्यौली – Nepali" lang="ne" hreflang="ne" data-title="बुढ्यौली" data-language-autonym="नेपाली" data-language-local-name="Nepali" class="interlanguage-link-target">नेपाली</a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E8%80%81%E5%8C%96" title="老化 – Japanese" lang="ja" hreflang="ja" data-title="老化" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target">日本語</a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Elding" title="Elding – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Elding" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target">Norsk nynorsk</a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Proces_starzenia_si%C4%99" title="Proces starzenia się – Polish" lang="pl" hreflang="pl" data-title="Proces starzenia się" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target">Polski</a></li><li 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href="https://ru.wikipedia.org/wiki/%D0%A1%D1%82%D0%B0%D1%80%D0%B5%D0%BD%D0%B8%D0%B5_%D1%87%D0%B5%D0%BB%D0%BE%D0%B2%D0%B5%D0%BA%D0%B0" title="Старение человека – Russian" lang="ru" hreflang="ru" data-title="Старение человека" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target">Русский</a></li><li class="interlanguage-link interwiki-sco mw-list-item"><a href="https://sco.wikipedia.org/wiki/Agein" title="Agein – Scots" lang="sco" hreflang="sco" data-title="Agein" data-language-autonym="Scots" data-language-local-name="Scots" class="interlanguage-link-target">Scots</a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Plakja" title="Plakja – Albanian" lang="sq" hreflang="sq" data-title="Plakja" data-language-autonym="Shqip" data-language-local-name="Albanian" class="interlanguage-link-target">Shqip</a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a 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<style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about ageing specifically in humans. For the ageing of whole organisms including animals, see <a href="/wiki/Senescence" title="Senescence">Senescence</a>. 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screen{html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-night .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-list-title,html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle{background:transparent!important}html.skin-theme-clientpref-os .mw-parser-output .sidebar:not(.notheme) .sidebar-title-with-pretitle a{color:var(--color-progressive)!important}}@media print{body.ns-0 .mw-parser-output .sidebar{display:none!important}}</style><style data-mw-deduplicate="TemplateStyles:r1040468660">.mw-parser-output .human-growth-dev-sidebar .sidebar-title-with-pretitle{background-color:#ccf}.mw-parser-output .human-growth-dev-sidebar .sidebar-heading{background-color:#ddf}.mw-parser-output .human-growth-dev-sidebar .sidebar-below{border-top:1px solid #aaa;border-bottom:1px solid #aaa}</style><table class="sidebar nomobile nowraplinks hlist human-growth-dev-sidebar"><tbody><tr><td class="sidebar-pretitle">Part of <a href="/wiki/Category:Human_development" title="Category:Human development">a series</a> on</td></tr><tr><th class="sidebar-title-with-pretitle"><a href="/wiki/Development_of_the_human_body" title="Development of the human body">Human growth and development</a></th></tr><tr><td class="sidebar-image"><a href="/wiki/File:Views_of_a_Foetus_in_the_Womb_detail.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Views_of_a_Foetus_in_the_Womb_detail.jpg/100px-Views_of_a_Foetus_in_the_Womb_detail.jpg" decoding="async" width="100" height="139" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Views_of_a_Foetus_in_the_Womb_detail.jpg/150px-Views_of_a_Foetus_in_the_Womb_detail.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2a/Views_of_a_Foetus_in_the_Womb_detail.jpg/200px-Views_of_a_Foetus_in_the_Womb_detail.jpg 2x" data-file-width="400" data-file-height="556" /></a></td></tr><tr><th class="sidebar-heading"> Stages</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Gamete" title="Gamete">Gamete</a></li> <li><a href="/wiki/Zygote" title="Zygote">Zygote</a></li> <li><a href="/wiki/Human_embryonic_development" title="Human embryonic development">Embryo</a></li> <li><a href="/wiki/Fetus" title="Fetus">Fetus</a> </li> <li><a href="/wiki/Infant" title="Infant">Infant</a></li> <li><a href="/wiki/Toddler" title="Toddler">Toddler</a> </li> <li><a href="/wiki/Child" title="Child">Child</a></li> <li><a href="/wiki/Preadolescence" title="Preadolescence">Preadolescent</a></li> <li><a href="/wiki/Adolescence" title="Adolescence">Adolescent</a> </li> <li><a href="/wiki/Emerging_adulthood_and_early_adulthood" title="Emerging adulthood and early adulthood">Emerging and early adulthood</a></li> <li><a href="/wiki/Young_adult" title="Young adult">Young adult</a></li> <li><a href="/wiki/Middle_age" title="Middle age">Middle adult</a></li> <li><a href="/wiki/Old_age" title="Old age">Old adult</a></li> <li><a href="/wiki/Dying" title="Dying">Dying</a></li></ul></td> </tr><tr><th class="sidebar-heading"> Biological milestones</th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Human_fertilization" title="Human fertilization">Fertilization</a></li> <li><a href="/wiki/Pregnancy" title="Pregnancy">Pregnancy</a></li> <li><a href="/wiki/Childbirth" title="Childbirth">Childbirth</a></li> <li><a href="/wiki/Gross_motor_skill#Learning_to_walk" title="Gross motor skill">Walking</a></li> <li><a href="/wiki/Language_acquisition" title="Language acquisition">Language acquisition</a></li> <li><a href="/wiki/Puberty" title="Puberty">Puberty</a></li> <li><a href="/wiki/Menopause" title="Menopause">Menopause</a></li> <li><a class="mw-selflink selflink">Ageing</a></li> <li><a href="/wiki/Death" title="Death">Death</a></li></ul></td> </tr><tr><th class="sidebar-heading"> <a href="/wiki/Developmental_psychology" title="Developmental psychology">Development and psychology</a></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Prenatal_and_perinatal_psychology" title="Prenatal and perinatal psychology">Pre- and perinatal</a> <ul><li><a href="/wiki/Prenatal_development" title="Prenatal development">Development</a></li></ul></li> <li><a href="/wiki/Child_development_stages" title="Child development stages">Infant and child</a></li> <li><a href="/wiki/Nature_versus_nurture" title="Nature versus nurture">Nature versus nurture</a></li> <li><a href="/wiki/Adolescence#psychology" title="Adolescence">Adolescent</a></li> <li><a href="/wiki/Positive_youth_development" title="Positive youth development">Youth</a></li> <li><a href="/wiki/Young_adult" title="Young adult">Young adult</a></li> <li><a href="/wiki/Adult_development" title="Adult development">Adult</a></li> <li><a href="/wiki/Maturity_(psychological)" title="Maturity (psychological)">Maturity</a></li></ul></td> </tr><tr><th class="sidebar-heading"> <div style="display: inline-block; line-height: 1.2em; padding: .1em 0;"><a href="/wiki/Developmental_stage_theories" title="Developmental stage theories">Developmental stage theories</a></div></th></tr><tr><td class="sidebar-content"> <ul><li><a href="/wiki/Attachment_theory" title="Attachment theory">Attachment</a></li> <li><a href="/wiki/Ecological_systems_theory" title="Ecological systems theory">Ecological</a></li> <li><a href="/wiki/Erikson%27s_stages_of_psychosocial_development" title="Erikson's stages of psychosocial development">Psychosocial</a></li> <li><a href="/wiki/Psychosexual_development" title="Psychosexual development">Psychosexual development</a></li> <li><a href="/wiki/Lawrence_Kohlberg%27s_stages_of_moral_development" title="Lawrence Kohlberg's stages of moral development">Moral</a></li> <li><a href="/wiki/Piaget%27s_theory_of_cognitive_development" title="Piaget's theory of cognitive development">Cognitive</a></li> <li><a href="/wiki/Cultural-historical_psychology" title="Cultural-historical psychology">Cultural-historical</a></li> <li><a href="/wiki/Evolutionary_developmental_psychology" title="Evolutionary developmental psychology">Evolutionary</a></li></ul></td> </tr><tr><td class="sidebar-below"> <ul><li><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Psi2.svg/20px-Psi2.svg.png" decoding="async" width="15" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Psi2.svg/40px-Psi2.svg.png 1.5x" data-file-width="100" data-file-height="100" /> <a href="/wiki/Portal:Psychology" title="Portal:Psychology">Psychology portal</a></li></ul></td></tr><tr><td class="sidebar-navbar"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><style data-mw-deduplicate="TemplateStyles:r1239400231">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar-collapse{float:left;text-align:left}.mw-parser-output .navbar-boxtext{word-spacing:0}.mw-parser-output .navbar ul{display:inline-block;white-space:nowrap;line-height:inherit}.mw-parser-output .navbar-brackets::before{margin-right:-0.125em;content:"[ "}.mw-parser-output .navbar-brackets::after{margin-left:-0.125em;content:" ]"}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbar a>span,.mw-parser-output .navbar a>abbr{text-decoration:inherit}.mw-parser-output .navbar-mini abbr{font-variant:small-caps;border-bottom:none;text-decoration:none;cursor:inherit}.mw-parser-output .navbar-ct-full{font-size:114%;margin:0 7em}.mw-parser-output .navbar-ct-mini{font-size:114%;margin:0 4em}html.skin-theme-clientpref-night .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Human_growth_and_development_sidebar" title="Template:Human growth and development sidebar"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Human_growth_and_development_sidebar" title="Template talk:Human growth and development sidebar"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Human_growth_and_development_sidebar" title="Special:EditPage/Template:Human growth and development sidebar"><abbr title="Edit this template">e</abbr></a></li></ul></div></td></tr></tbody></table> Ageing (or aging in <a href="/wiki/American_English" title="American English">American English</a>) is the process of becoming <a href="/wiki/Old_age" title="Old age">older</a> until <a href="/wiki/Death" title="Death">death</a>. The term refers mainly to <a href="/wiki/Human" title="Human">humans</a>, many other <a href="/wiki/Animal" title="Animal">animals</a>, and fungi; whereas for example, bacteria, <a href="/wiki/Perennial_plants" class="mw-redirect" title="Perennial plants">perennial plants</a> and some simple animals are potentially <a href="/wiki/Biologically_immortal" class="mw-redirect" title="Biologically immortal">biologically immortal</a>. In a broader sense, ageing can refer to single cells within an organism which have <a href="/wiki/Cellular_senescence" title="Cellular senescence">ceased dividing</a>, or to the <a href="/wiki/Population_ageing" title="Population ageing">population of a species</a>.<a href="#cite_note-1">[1]</a> In humans, ageing represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes.<a href="#cite_note-2">[2]</a><a href="#cite_note-3">[3]</a> Reaction time, for example, may slow with age, while memories and general knowledge typically increase. Ageing is associated with increased risk of cancer, <a href="/wiki/Alzheimer%27s_disease" title="Alzheimer's disease">Alzheimer's disease</a>, <a href="/wiki/Diabetes" title="Diabetes">diabetes</a>, <a href="/wiki/Cardiovascular_disease" title="Cardiovascular disease">cardiovascular disease</a>, increased <a href="/wiki/Mental_health" title="Mental health">mental health</a> risks, and <a href="/wiki/Aging-associated_diseases" title="Aging-associated diseases">many more</a>.<a href="#cite_note-4">[4]</a><a href="#cite_note-5">[5]</a> Of the roughly 150,000 people who die each day across the globe, about two-thirds die from age-related causes.<a href="#cite_note-6">[6]</a> Certain lifestyle choices and socioeconomic conditions have been linked to ageing.<a href="#cite_note-7">[7]</a> Current <a href="/wiki/Theory_of_aging" class="mw-redirect" title="Theory of aging">ageing theories</a> are assigned to the damage concept, whereby the accumulation of damage (such as <a href="/wiki/DNA_oxidation" title="DNA oxidation">DNA oxidation</a>) may cause biological systems to fail, or to the programmed ageing concept, whereby the internal processes (epigenetic maintenance such as <a href="/wiki/DNA_methylation" title="DNA methylation">DNA methylation</a>)<a href="#cite_note-8">[8]</a> inherently may cause ageing. Programmed ageing should not be confused with programmed cell death (<a href="/wiki/Apoptosis" title="Apoptosis">apoptosis</a>). <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Ageing_versus_immortality">Ageing versus immortality</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=1" title="Edit section: Ageing versus immortality">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Hydras_(8).JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Hydras_%288%29.JPG/250px-Hydras_%288%29.JPG" decoding="async" width="170" height="159" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Hydras_%288%29.JPG/330px-Hydras_%288%29.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b6/Hydras_%288%29.JPG/500px-Hydras_%288%29.JPG 2x" data-file-width="2051" data-file-height="1920" /></a><figcaption>Immortal <a href="/wiki/Hydra_(genus)" title="Hydra (genus)">Hydra</a>, a relative of the jellyfish</figcaption></figure> Human beings and members of other species, especially animals, age and die. Fungi, too, can age.<a href="#cite_note-Mortimer_1959-9">[9]</a> In contrast, many species can be considered potentially <a href="/wiki/Biological_immortality" title="Biological immortality">immortal</a>: for example, bacteria fission to produce daughter cells, <a href="/wiki/Strawberry" title="Strawberry">strawberry</a> plants grow runners to produce clones of themselves, and animals in the genus <a href="/wiki/Hydra_(genus)" title="Hydra (genus)">Hydra</a> have a regenerative ability by which they avoid dying of old age. Early life forms on Earth, starting at least 3.7 billion years ago,<a href="#cite_note-Nutman_2016-10">[10]</a> were single-celled organisms. Such organisms (<a href="/wiki/Prokaryote" title="Prokaryote">Prokaryotes</a>, <a href="/wiki/Protozoa" title="Protozoa">Protozoans</a>, <a href="/wiki/Algae" title="Algae">algae</a>) multiply by <a href="/wiki/Fission_(biology)" title="Fission (biology)">fission</a> into daughter cells; thus single celled organisms have been thought to not age and to be potentially immortal under favorable conditions.<a href="#cite_note-Rose1991-11">[11]</a><a href="#cite_note-Partridge1993-12">[12]</a> However, evidence has been reported that aging leading to death occurs in the single-cell bacterium Escherichia coli, an organism that reproduces by <a href="/wiki/Morphology_(biology)" title="Morphology (biology)">morphologically</a> symmetrical division.<a href="#cite_note-Stewart2005-13">[13]</a> Evidence of aging has also been reported for the bacterium Caulobacter crescintus.<a href="#cite_note-14">[14]</a> and the single cell yeast Saccharomyces cerevisiae.<a href="#cite_note-15">[15]</a><a href="#cite_note-16">[16]</a> Ageing and mortality of the individual organism became more evident with the evolution of eukaryotic <a href="/wiki/Sexual_reproduction" title="Sexual reproduction">sexual reproduction</a>,<a href="#cite_note-Williams1957-17">[17]</a> which occurred with the emergence of the fungal/animal kingdoms approximately a billion years ago, and the evolution of <a href="/wiki/Spermatophyte" class="mw-redirect" title="Spermatophyte">seed-producing plants</a> 320 million years ago. The sexual organism could henceforth pass on some of its genetic material to produce new individuals and could itself <a href="/wiki/Evolution_of_ageing#Disposable_soma_theory" title="Evolution of ageing">become disposable</a> with respect to the survival of its species.<a href="#cite_note-Williams1957-17">[17]</a> This classic biological idea has however been perturbed recently by the discovery that the bacterium <a href="/wiki/E._coli" class="mw-redirect" title="E. coli">E. coli</a> may split into distinguishable daughter cells, which opens the theoretical possibility of "age classes" among bacteria.<a href="#cite_note-Stewart2005-13">[13]</a> Even within humans and other mortal species, there are cells with the potential for immortality: cancer cells which have lost the ability to die when maintained in a cell culture such as the <a href="/wiki/HeLa" title="HeLa">HeLa</a> cell line,<a href="#cite_note-PereiraSmith1992-18">[18]</a> and specific <a href="/wiki/Stem_cell" title="Stem cell">stem cells</a> such as <a href="/wiki/Germ_cell" title="Germ cell">germ cells</a> (producing <a href="/wiki/Egg_cell" title="Egg cell">ova</a> and <a href="/wiki/Spermatozoon" title="Spermatozoon">spermatozoa</a>).<a href="#cite_note-Forster_2015-19">[19]</a> In artificial <a href="/wiki/Cloning" title="Cloning">cloning</a>, adult cells can be rejuvenated to embryonic status and then used to grow a new tissue or animal without ageing.<a href="#cite_note-Wakayama_2013-20">[20]</a> Normal human cells however die after about 50 cell divisions in laboratory culture (the <a href="/wiki/Hayflick_Limit" class="mw-redirect" title="Hayflick Limit">Hayflick Limit</a>, discovered by <a href="/wiki/Leonard_Hayflick" title="Leonard Hayflick">Leonard Hayflick</a> in 1961).<a href="#cite_note-PereiraSmith1992-18">[18]</a> <div class="mw-heading mw-heading2"><h2 id="Symptoms">Symptoms</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=2" title="Edit section: Symptoms">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Old_age#Signs" title="Old age">Old age § Signs</a></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output 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listen noprint"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><figure class="mw-halign-center" typeof="mw:File"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Gnome-mime-sound-openclipart.svg/60px-Gnome-mime-sound-openclipart.svg.png" decoding="async" width="50" height="50" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/87/Gnome-mime-sound-openclipart.svg/120px-Gnome-mime-sound-openclipart.svg.png 1.5x" data-file-width="160" data-file-height="160" /><figcaption></figcaption></figure></div> <div class="side-box-text plainlist"><div class="haudio"> <div class="listen-file-header"><a href="/wiki/File:17.4_kHz_sine_wave.flac" title="File:17.4 kHz sine wave.flac">Hearing loss with age (presbycusis)</a></div> <div><audio id="mwe_player_0" controls="" preload="none" data-mw-tmh="" class="mw-file-element" width="232" style="width:232px;" data-durationhint="10" data-mwtitle="17.4_kHz_sine_wave.flac" data-mwprovider="wikimediacommons"><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/17.4_kHz_sine_wave.flac/17.4_kHz_sine_wave.flac.ogg" type="audio/ogg; codecs="vorbis"" data-transcodekey="ogg" data-width="0" data-height="0" /><source src="//upload.wikimedia.org/wikipedia/commons/transcoded/7/7d/17.4_kHz_sine_wave.flac/17.4_kHz_sine_wave.flac.mp3" type="audio/mpeg" data-transcodekey="mp3" data-width="0" data-height="0" /><source src="//upload.wikimedia.org/wikipedia/commons/7/7d/17.4_kHz_sine_wave.flac" type="audio/flac" data-width="0" data-height="0" /></audio></div> <div class="description">Teenagers begin to lose the ability to hear high-pitched sounds.<a href="#cite_note-HiFreqAudiometry2014-21">[21]</a> Beyond the age of 25, many adults cannot hear this 10-second audio clip at a frequency of 17.4 kHz.<a href="#cite_note-22">[22]</a></div></div></div></div> <div class="side-box-abovebelow"><hr />Problems playing this file? See <a href="/wiki/Help:Media" title="Help:Media">media help</a>.</div> </div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Senescence.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Senescence.JPG/170px-Senescence.JPG" decoding="async" width="170" height="205" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Senescence.JPG/255px-Senescence.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Senescence.JPG/340px-Senescence.JPG 2x" data-file-width="1100" data-file-height="1329" /></a><figcaption>Enlarged ears and noses of old humans are sometimes blamed on continual cartilage growth, but the cause is more probably gravity.<a href="#cite_note-Guardian2013-23">[23]</a></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Age_dynamics_of_the_body_mass.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Age_dynamics_of_the_body_mass.svg/250px-Age_dynamics_of_the_body_mass.svg.png" decoding="async" width="220" height="171" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/32/Age_dynamics_of_the_body_mass.svg/330px-Age_dynamics_of_the_body_mass.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/32/Age_dynamics_of_the_body_mass.svg/500px-Age_dynamics_of_the_body_mass.svg.png 2x" data-file-width="512" data-file-height="397" /></a><figcaption>Age dynamics of the body mass (1, 2) and mass normalized to height (3, 4) of men (1, 3) and women (2, 4)<a href="#cite_note-Age_dynamics-24">[24]</a></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Alzheimer%27s_disease_brain_comparison.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Alzheimer%27s_disease_brain_comparison.jpg/250px-Alzheimer%27s_disease_brain_comparison.jpg" decoding="async" width="220" height="99" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Alzheimer%27s_disease_brain_comparison.jpg/330px-Alzheimer%27s_disease_brain_comparison.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Alzheimer%27s_disease_brain_comparison.jpg/500px-Alzheimer%27s_disease_brain_comparison.jpg 2x" data-file-width="3984" data-file-height="1800" /></a><figcaption>Comparison of a normal aged brain (left) and a brain affected by <a href="/wiki/Alzheimer%27s_disease" title="Alzheimer's disease">Alzheimer's disease</a></figcaption></figure> A number of characteristic ageing symptoms are experienced by a majority, or by a significant proportion of humans during their lifetimes. <ul><li>Teenagers lose the young child's ability to <a href="/wiki/Presbycusis" title="Presbycusis">hear</a> high-frequency sounds above 20 kHz.<a href="#cite_note-HiFreqAudiometry2014-21">[21]</a></li> <li><a href="/wiki/Wrinkle" title="Wrinkle">Wrinkles</a> develop mainly due to <a href="/wiki/Photoageing" class="mw-redirect" title="Photoageing">photoageing</a>, particularly affecting sun-exposed areas such as the face.<a href="#cite_note-Thurstan_2012-25">[25]</a></li> <li>After <a href="/wiki/Age_and_female_fertility" title="Age and female fertility">peaking from the late teens to the late 20s, female fertility</a> declines.<a href="#cite_note-26">[26]</a></li> <li>After age 30, the mass of the human body is decreased until 70 years and then shows damping oscillations.<a href="#cite_note-Age_dynamics-24">[24]</a></li> <li>People over 35 years of age are at increasing risk for losing strength in the <a href="/wiki/Ciliary_muscle" title="Ciliary muscle">ciliary muscle</a> of the eyes, which leads to difficulty focusing on close objects, or <a href="/wiki/Presbyopia" title="Presbyopia">presbyopia</a>.<a href="#cite_note-27">[27]</a><a href="#cite_note-Weale_2003-28">[28]</a> Most people experience <a href="/wiki/Presbyopia" title="Presbyopia">presbyopia</a> by age 45–50.<a href="#cite_note-Truscott_2009-29">[29]</a> The cause is lens hardening by decreasing levels of <a href="/wiki/Alpha-crystallin" class="mw-redirect" title="Alpha-crystallin">alpha-crystallin</a>, a process which may be sped up by higher temperatures.<a href="#cite_note-Truscott_2009-29">[29]</a><a href="#cite_note-30">[30]</a></li> <li>Around age 55, <a href="/wiki/Human_hair_color#Aging_or_achromotrichia" title="Human hair color">hair turns grey</a>.<a href="#cite_note-31">[31]</a> <a href="/wiki/Pattern_hair_loss" title="Pattern hair loss">Pattern hair loss</a> by the age of 55 affects about 30–50% of males<a href="#cite_note-32">[32]</a> and a quarter of females.<a href="#cite_note-Var2015-33">[33]</a></li> <li><a href="/wiki/Menopause" title="Menopause">Menopause</a> typically occurs between 44 and 58 years of age.<a href="#cite_note-34">[34]</a></li> <li>In the 60–64 age cohort, the incidence of <a href="/wiki/Osteoarthritis" title="Osteoarthritis">osteoarthritis</a> rises to 53%. Only 20%, however, report disabling osteoarthritis at this age.<a href="#cite_note-Thomas2014-35">[35]</a></li> <li>Almost half of people older than 75 have <a href="/wiki/Hearing_loss" title="Hearing loss">hearing loss</a> (presbycusis), inhibiting spoken communication.<a href="#cite_note-36">[36]</a> Many vertebrates such as fish, birds and amphibians do not develop presbycusis in old age, as they are able to regenerate their <a href="/wiki/Cochlea" title="Cochlea">cochlear</a> sensory cells; mammals, including humans, have genetically lost this ability.<a href="#cite_note-Rubel2013-37">[37]</a></li> <li>By age 80, more than half of all Americans either have a <a href="/wiki/Cataract" title="Cataract">cataract</a> or have had <a href="/wiki/Cataract_surgery" title="Cataract surgery">cataract surgery</a>.<a href="#cite_note-NIH2009-38">[38]</a></li> <li><a href="/wiki/Frailty_syndrome" title="Frailty syndrome">Frailty</a>, a syndrome of decreased strength, physical activity, physical performance and energy, affects 25% of those over 85.<a href="#cite_note-Fried_2001-39">[39]</a><a href="#cite_note-40">[40]</a> Muscles have a reduced capacity of responding to exercise or injury and loss of muscle mass and strength (<a href="/wiki/Sarcopenia" title="Sarcopenia">sarcopenia</a>) is common.<a href="#cite_note-41">[41]</a> Maximum oxygen use and maximum heart rate decline.<a href="#cite_note-42">[42]</a> Hand strength and mobility decrease.<a href="#cite_note-43">[43]</a></li> <li><a href="/wiki/Atherosclerosis" title="Atherosclerosis">Atherosclerosis</a> is classified as an ageing disease.<a href="#cite_note-Wang_2012-44">[44]</a> It leads to cardiovascular disease (for example, stroke and heart attacks),<a href="#cite_note-Wang_2016-45">[45]</a> which, globally, is the most common cause of death.<a href="#cite_note-46">[46]</a> Vessel ageing causes vascular remodelling and loss of arterial elasticity, and as a result, causes the stiffness of the vasculature.<a href="#cite_note-Wang_2012-44">[44]</a></li> <li>Evidence suggests that age-related risk of death plateaus after the age of 105.<a href="#cite_note-47">[47]</a> The maximum human lifespan is suggested to be <a href="/wiki/Old_age" title="Old age">115 years</a>.<a href="#cite_note-NYT-20161005-48">[48]</a><a href="#cite_note-NAT-20151005-49">[49]</a> The oldest reliably recorded human was <a href="/wiki/Jeanne_Calment" title="Jeanne Calment">Jeanne Calment</a>, who died in 1997 at 122.</li></ul> <a href="/wiki/Dementia" title="Dementia">Dementia</a> becomes more common with age.<a href="#cite_note-Larson2013-50">[50]</a> About 3% of people between the ages of 65 and 74, 19% of those between 75 and 84, and nearly half of those over 85 years old have dementia.<a href="#cite_note-51">[51]</a> The spectrum ranges from <a href="/wiki/Mild_cognitive_impairment" title="Mild cognitive impairment">mild cognitive impairment</a> to the neurodegenerative diseases of <a href="/wiki/Alzheimer%27s_disease" title="Alzheimer's disease">Alzheimer's disease</a>, <a href="/wiki/Cerebrovascular_disease" title="Cerebrovascular disease">cerebrovascular disease</a>, <a href="/wiki/Parkinson%27s_disease" title="Parkinson's disease">Parkinson's disease</a> and <a href="/wiki/Lou_Gehrig%27s_disease" class="mw-redirect" title="Lou Gehrig's disease">Lou Gehrig's disease</a>. Furthermore, many types of <a href="/wiki/Memory_and_aging" title="Memory and aging">memory decline with ageing</a>, but not <a href="/wiki/Semantic_memory" title="Semantic memory">semantic memory</a> or general knowledge such as vocabulary definitions. These typically increase or remain steady until late adulthood <a href="#cite_note-Schaie2005-52">[52]</a> (see <a href="/wiki/Aging_brain" title="Aging brain">Ageing brain</a>). <a href="/wiki/Intelligence" title="Intelligence">Intelligence</a> declines with age, though the rate varies depending on the <a href="/wiki/Theory_of_multiple_intelligences" title="Theory of multiple intelligences">type</a> and may, in fact, remain steady throughout most of the human lifespan, dropping suddenly only as people near the end of their lives. Individual variations in the rate of cognitive decline may therefore be explained in terms of people having different lengths of life.<a href="#cite_note-Stuart-53">[53]</a> There are changes to the brain: after 20 years of age, there is a 10% reduction each decade in the total length of the brain's <a href="/wiki/Myelinated" class="mw-redirect" title="Myelinated">myelinated</a> <a href="/wiki/Axons" class="mw-redirect" title="Axons">axons</a>.<a href="#cite_note-Marner-54">[54]</a><a href="#cite_note-55">[55]</a> Age can result in <a href="/wiki/Visual_impairment" title="Visual impairment">visual impairment</a>, whereby <a href="/wiki/Non-verbal_communication" class="mw-redirect" title="Non-verbal communication">non-verbal communication</a> is reduced,<a href="#cite_note-56">[56]</a> which can lead to isolation and possible depression. Older adults, however, may not experience depression as much as younger adults, and were paradoxically found to have improved mood, despite declining physical health.<a href="#cite_note-57">[57]</a> <a href="/wiki/Macular_degeneration" title="Macular degeneration">Macular degeneration</a> causes vision loss and increases with age, affecting nearly 12% of those above the age of 80.<a href="#cite_note-Meh2015-58">[58]</a> This degeneration is caused by systemic changes in the circulation of waste products and by the growth of abnormal vessels around the retina.<a href="#cite_note-Nussbaum,_J._F._1989-59">[59]</a> Other visual diseases that often appear with age are cataracts and glaucoma. A cataract occurs when the lens of the eye becomes cloudy, making vision blurry; it eventually causes blindness if untreated.<a href="#cite_note-60">[60]</a> They develop over time and are seen most often with those that are older. Cataracts can be treated through surgery. Glaucoma is another common visual disease that appears in older adults. Glaucoma is caused by damage to the optic nerve, causing vision loss.<a href="#cite_note-nei.nih.gov-61">[61]</a> Glaucoma usually develops over time, but there are variations to glaucoma, and some have a sudden onset. There are a few procedures for glaucoma, but there is no cure or fix for the damage, once it has occurred. Prevention is the best measure in the case of glaucoma.<a href="#cite_note-nei.nih.gov-61">[61]</a> In addition to physical symptoms, aging can also cause a number of mental health issues as older adults deal with challenges such as the death of loved ones, retirement and loss of purpose, as well as their own health issues. Some warning signs are: changes in mood or energy, changes in sleep or eating habits, pain, sadness, unhealthy coping mechanisms such as smoking, suicidal ideations, and others. <a rel="nofollow" class="external text" href="https://medlineplus.gov/olderadultmentalhealth.html">Older Adult Mental Health</a> Older adults are more prone to social isolation as well, which can further increase the risk for physical and mental conditions such as anxiety, depression, and cognitive decline. <a rel="nofollow" class="external text" href="https://www.nia.nih.gov/news/social-isolation-loneliness-older-people-pose-health-risks">Social isolation, loneliness in older people pose health risks</a> A distinction can be made between "proximal ageing" (age-based effects that come about because of factors in the recent past) and "distal ageing" (age-based differences that can be traced to a cause in a person's early life, such as childhood <a href="/wiki/Poliomyelitis" class="mw-redirect" title="Poliomyelitis">poliomyelitis</a>).<a href="#cite_note-Stuart-53">[53]</a> Ageing is among the greatest known risk factors for most human <a href="/wiki/Aging-associated_diseases" title="Aging-associated diseases">diseases</a>. Of the roughly 150,000 people who die each day across the globe, about two-thirds--100,000 per day--die from <a href="/wiki/Aging-associated_diseases" title="Aging-associated diseases">age-related causes</a>.<a href="#cite_note-de_Grey_2007-62">[62]</a> In industrialized nations, the proportion is higher, reaching 90%.<a href="#cite_note-de_Grey_2007-62">[62]</a><a href="#cite_note-Lopez_2006-63">[63]</a><a href="#cite_note-64">[64]</a> <div class="mw-heading mw-heading2"><h2 id="Biological_basis">Biological basis</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=3" title="Edit section: Biological basis">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Senescence" title="Senescence">Senescence</a></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Old_woman_with_young_baby_boy.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/48/Old_woman_with_young_baby_boy.JPG/170px-Old_woman_with_young_baby_boy.JPG" decoding="async" width="170" height="227" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/48/Old_woman_with_young_baby_boy.JPG/255px-Old_woman_with_young_baby_boy.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/48/Old_woman_with_young_baby_boy.JPG/340px-Old_woman_with_young_baby_boy.JPG 2x" data-file-width="1536" data-file-height="2048" /></a><figcaption>95-year-old woman holding a five-month-old boy</figcaption></figure> In the 21st century, researchers are only beginning to investigate the biological basis of ageing even in relatively simple and short-lived organisms, such as <a href="/wiki/Yeast" title="Yeast">yeast</a>.<a href="#cite_note-Janssens_2015-65">[65]</a> Little is known of mammalian ageing, in part due to the much longer lives of even small mammals, such as the mouse (around 3 years). A <a href="/wiki/Model_organism" title="Model organism">model organism</a> for the study of ageing is the <a href="/wiki/Nematode" title="Nematode">nematode</a> <a href="/wiki/Caenorhabditis_elegans" title="Caenorhabditis elegans">C. elegans</a> – having a short lifespan of 2–3 weeks – enabling genetic manipulations or suppression of gene activity with <a href="/wiki/RNA_interference" title="RNA interference">RNA interference</a>, and other factors.<a href="#cite_note-RothmanSingson2012-66">[66]</a> Most known mutations and RNA interference targets that extend lifespan were first discovered in C. elegans.<a href="#cite_note-Reis2009-67">[67]</a> The factors proposed to influence biological ageing fall into two main categories, programmed and error-related.<a href="#cite_note-Jin_2010-68">[68]</a> Programmed factors follow a biological timetable that might be a continuation of inherent mechanisms that regulate childhood growth and development.<a href="#cite_note-Jin_2010-68">[68]</a> This regulation would depend on changes in <a href="/wiki/Gene_expression" title="Gene expression">gene expression</a> that affect the systems responsible for maintenance, repair and defense responses.<a href="#cite_note-Jin_2010-68">[68]</a> Factors causing errors or damage include internal and environmental events that induce cumulative deterioration in one or more <a href="/wiki/Organ_(biology)" title="Organ (biology)">organs</a>.<a href="#cite_note-Jin_2010-68">[68]</a> <div class="mw-heading mw-heading3"><h3 id="Molecular_and_cellular_hallmarks_of_ageing">Molecular and cellular hallmarks of ageing</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=4" title="Edit section: Molecular and cellular hallmarks of ageing">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Hallmarks_of_aging" title="Hallmarks of aging">Hallmarks of aging</a></div> One 2013 review assessed ageing through the lens of the damage theory, proposing nine metabolic "hallmarks" of ageing in various organisms but especially mammals:<a href="#cite_note-Lopez-Otin2013-69">[69]</a> <ul><li><a href="/wiki/Genome_instability" title="Genome instability">genomic instability</a> (mutations accumulated in nuclear DNA, in mtDNA, and in the nuclear lamina)</li> <li><a href="/wiki/Telomere" title="Telomere">telomere</a> attrition (the authors note that artificial telomerase confers non-cancerous immortality to otherwise mortal cells)</li> <li><a href="/wiki/Epigenetics" title="Epigenetics">epigenetic</a> alterations (including DNA methylation patterns, post-translational modification of histones, and chromatin remodelling). Ageing and disease are related to a misregulation of gene expression through impaired methylation patterns, from hypomethylation to hypermethylation. <a href="#cite_note-Arleo_et_al.-70">[70]</a></li> <li>loss of <a href="/wiki/Proteostasis" title="Proteostasis">proteostasis</a> (protein folding and proteolysis)</li> <li>deregulated nutrient sensing (relating to the <a href="/wiki/Insulin-like_growth_factor_1#Aging" title="Insulin-like growth factor 1">Growth hormone/Insulin-like growth factor 1 signalling pathway</a>[<a href="/wiki/MOS:BROKENSECTIONLINKS" class="mw-redirect" title="MOS:BROKENSECTIONLINKS">broken anchor</a>], which is the most conserved ageing-controlling pathway in evolution and among its targets are the <a href="/wiki/FOXO" class="mw-redirect" title="FOXO">FOXO</a>3/<a href="/wiki/Sirtuin" title="Sirtuin">Sirtuin</a> transcription factors and the <a href="/wiki/MTOR" title="MTOR">mTOR</a> complexes, probably responsive to <a href="/wiki/Caloric_restriction" class="mw-redirect" title="Caloric restriction">caloric restriction</a>)</li> <li><a href="/wiki/Mitochondrial_disease" title="Mitochondrial disease">mitochondrial dysfunction</a> (the authors point out however that a causal link between ageing and increased mitochondrial production of reactive oxygen species is no longer supported by recent research)</li> <li><a href="/wiki/Cellular_senescence" title="Cellular senescence">cellular senescence</a> (accumulation of no longer dividing cells in certain tissues, a process induced especially by <a href="/wiki/P16" title="P16">p16</a>INK4a/Rb and p19ARF/<a href="/wiki/P53" title="P53">p53</a> to stop cancerous cells from proliferating)</li> <li><a href="/wiki/Stem_cell" title="Stem cell">stem cell</a> exhaustion (in the authors' view caused by damage factors such as those listed above)</li> <li>altered intercellular communication (encompassing especially inflammation but possibly also other intercellular interactions)</li> <li><a href="/wiki/Inflammageing" class="mw-redirect" title="Inflammageing">inflammageing</a>, a chronic inflammatory <a href="/wiki/Phenotype" title="Phenotype">phenotype</a> in the elderly in the absence of viral infection, due to over-activation and a decrease in the precision of the innate immune system</li> <li>dysbiosis of gut <a href="/wiki/Microbiome" title="Microbiome">microbiome</a> (e.g., loss of microbial diversity, expansion of enteropathogens, and altered vitamin B12 biosynthesis) is correlated with biological age rather than chronological age.<a href="#cite_note-Ratiner2022-71">[71]</a></li></ul> <div class="mw-heading mw-heading3"><h3 id="Metabolic_pathways_involved_in_ageing">Metabolic pathways involved in ageing</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=5" title="Edit section: Metabolic pathways involved in ageing">edit</a>]</div> There are three main metabolic pathways which can influence the rate of ageing, discussed below: <ul><li>the <a href="/wiki/FOXO3" title="FOXO3">FOXO3</a>/<a href="/wiki/Sirtuin" title="Sirtuin">Sirtuin</a> pathway, probably responsive to <a href="/wiki/Caloric_restriction" class="mw-redirect" title="Caloric restriction">caloric restriction</a></li> <li>the <a href="/wiki/Insulin-like_growth_factor_1#Aging" title="Insulin-like growth factor 1">Growth hormone/Insulin-like growth factor 1 signalling pathway</a>[<a href="/wiki/MOS:BROKENSECTIONLINKS" class="mw-redirect" title="MOS:BROKENSECTIONLINKS">broken anchor</a>]</li> <li>the activity levels of the <a href="/wiki/Electron_transport_chain" title="Electron transport chain">electron transport chain</a> in mitochondria<a href="#cite_note-72">[72]</a> and (in plants) in chloroplasts.</li></ul> It is likely that most of these pathways affect ageing separately, because targeting them simultaneously leads to additive increases in lifespan.<a href="#cite_note-Taylor2011-73">[73]</a> <div class="mw-heading mw-heading3"><h3 id="Programmed_factors">Programmed factors</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=6" title="Edit section: Programmed factors">edit</a>]</div> The rate of ageing varies substantially across different species, and this, to a large extent, is genetically based. For example, numerous <a href="/wiki/Perennial_plant" class="mw-redirect" title="Perennial plant">perennial plants</a> ranging from strawberries and potatoes to <a href="/wiki/Willow#Cultivation" title="Willow">willow trees</a> typically produce clones of themselves by <a href="/wiki/Vegetative_reproduction" title="Vegetative reproduction">vegetative reproduction</a> and are thus potentially immortal, while <a href="/wiki/Annual_plants" class="mw-redirect" title="Annual plants">annual plants</a> such as wheat and watermelons die each year and reproduce by sexual reproduction. In 2008 it was discovered that inactivation of only two genes in the annual plant Arabidopsis thaliana leads to its conversion into a potentially immortal perennial plant.<a href="#cite_note-74">[74]</a> The oldest animals known so far are 15,000-year-old Antarctic <a href="/wiki/Sponge" title="Sponge">sponges</a>,<a href="#cite_note-BBC2017-OldestLivingThing-75">[75]</a> which can reproduce both sexually and clonally. Clonal immortality apart, there are certain species whose individual lifespans stand out among Earth's life-forms, including the <a href="/wiki/Bristlecone_pine" title="Bristlecone pine">bristlecone pine</a> at 5062 years<a href="#cite_note-oldest-76">[76]</a> or 5067 years,<a href="#cite_note-BBC2017-OldestLivingThing-75">[75]</a> invertebrates like the <a href="/wiki/Hard_clam" title="Hard clam">hard clam</a> (known as quahog in New England) at 508 years,<a href="#cite_note-Sosnowska2014-77">[77]</a> the <a href="/wiki/Greenland_shark" title="Greenland shark">Greenland shark</a> at 400 years,<a href="#cite_note-Nielsen2016-78">[78]</a> various deep-sea <a href="/wiki/Tube_worms" class="mw-redirect" title="Tube worms">tube worms</a> at over 300 years,<a href="#cite_note-Durkin2017-79">[79]</a> fish like the <a href="/wiki/Sturgeon" title="Sturgeon">sturgeon</a> and the <a href="/wiki/Sebastes" title="Sebastes">rockfish</a>, and the <a href="/wiki/Sea_anemone" title="Sea anemone">sea anemone</a><a href="#cite_note-80">[80]</a> and <a href="/wiki/Lobster" title="Lobster">lobster</a>.<a href="#cite_note-81">[81]</a><a href="#cite_note-82">[82]</a> Such organisms are sometimes said to exhibit <a href="/wiki/Negligible_senescence" title="Negligible senescence">negligible senescence</a>.<a href="#cite_note-83">[83]</a> The genetic aspect has also been demonstrated in studies of human <a href="/wiki/Research_into_centenarians" title="Research into centenarians">centenarians</a>. <div class="mw-heading mw-heading3"><h3 id="Evolution_of_ageing">Evolution of ageing</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=7" title="Edit section: Evolution of ageing">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Evolution_of_ageing" title="Evolution of ageing">Evolution of ageing</a></div> Life span, like other <a href="/wiki/Phenotypes" class="mw-redirect" title="Phenotypes">phenotypes</a>, is <a href="/wiki/Natural_selection" title="Natural selection">selected</a> for in evolution. Traits that benefit early survival and reproduction will be selected for even if they contribute to an earlier death. Such a genetic effect is called the <a href="/wiki/Antagonistic_pleiotropy_hypothesis" title="Antagonistic pleiotropy hypothesis">antagonistic pleiotropy</a> effect when referring to a gene (pleiotropy signifying the gene has a double function – enabling reproduction at a young age but costing the organism life expectancy in old age) and is called the <a href="/wiki/Evolution_of_aging" class="mw-redirect" title="Evolution of aging">disposable soma</a> effect when referring to an entire genetic programme (the organism diverting limited resources from maintenance to reproduction).<a href="#cite_note-Williams1957-17">[17]</a> The biological mechanisms which regulate lifespan probably evolved with the first multicellular organisms more than a billion years ago.<a href="#cite_note-Reis2009-67">[67]</a> However, even single-celled organisms such as yeast have been used as models in ageing, hence ageing has its biological roots much earlier than multi-cellularity.<a href="#cite_note-84">[84]</a> <div class="mw-heading mw-heading3"><h3 id="Damage-related_factors">Damage-related factors</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=8" title="Edit section: Damage-related factors">edit</a>]</div> <ul><li><a href="/wiki/DNA_damage_theory_of_aging" title="DNA damage theory of aging">DNA damage theory of ageing</a>: DNA damage is thought to be the common basis of both cancer and ageing, and it has been argued that intrinsic causes of <a href="/wiki/DNA_damage_(naturally_occurring)" title="DNA damage (naturally occurring)">DNA damage</a> are the most important causes of ageing.<a href="#cite_note-85">[85]</a><a href="#cite_note-86">[86]</a> Genetic damage (aberrant structural alterations of the DNA), <a href="/wiki/Mutation" title="Mutation">mutations</a> (changes in the DNA sequence), and epimutations (<a href="/wiki/Cancer_epigenetics#DNA_methylation" title="Cancer epigenetics">methylation of gene promoter regions</a> or alterations of the <a href="/wiki/Cancer_epigenetics#Histone_modification" title="Cancer epigenetics">DNA scaffolding</a> which <a href="/wiki/Regulation_of_gene_expression" title="Regulation of gene expression">regulate gene expression</a>), can cause abnormal gene expression. DNA damage causes the cells to stop dividing or induces <a href="/wiki/Apoptosis" title="Apoptosis">apoptosis</a>, often <a href="/wiki/Stem_cell_theory_of_aging" title="Stem cell theory of aging">affecting stem cell pools</a> and therefore hindering regeneration. However, lifelong studies of mice suggest that most mutations happen during embryonic and childhood development, when cells divide often, as each cell division is a chance for errors in DNA replication.<a href="#cite_note-87">[87]</a> A meta analysis study of 36 studies with 4,676 participants showed an association between age and <a href="/wiki/DNA_damage_(naturally_occurring)" title="DNA damage (naturally occurring)">DNA damage</a> in humans.<a href="#cite_note-88">[88]</a> In the human <a href="/wiki/Hematopoietic_stem_cell" title="Hematopoietic stem cell">hematopoietic stem cell</a> compartment DNA damage accumulates with age.<a href="#cite_note-89">[89]</a> In healthy humans after 50 years of age, chronological age shows a linear association with DNA damage accumulation in <a href="/wiki/Peripheral_blood_mononuclear_cell" title="Peripheral blood mononuclear cell">blood mononuclear cells</a>.<a href="#cite_note-90">[90]</a> Genome-wide profiles of DNA damage can be used as highly accurate predictors of mammalian age.<a href="#cite_note-91">[91]</a></li> <li><a href="/wiki/Genetic_instability" class="mw-redirect" title="Genetic instability">Genetic instability</a>: Dogs annually lose approximately 3.3% of the DNA in their heart muscle cells while humans lose approximately 0.6% of their heart muscle DNA each year. These numbers are close to the ratio of the maximum longevities of the two species (120 years vs. 20 years, a 6/1 ratio). The comparative percentage is also similar between the dog and human for yearly DNA loss in the brain and lymphocytes. As stated by lead author, <a href="/wiki/Bernard_L._Strehler" title="Bernard L. Strehler">Bernard L. Strehler</a>, "... genetic damage (particularly gene loss) is almost certainly (or probably the) central cause of ageing."<a href="#cite_note-92">[92]</a></li> <li>Accumulation of waste: <ul><li>A buildup of waste products in cells presumably interferes with <a href="/wiki/Metabolism" title="Metabolism">metabolism</a>. For example, a waste product called <a href="/wiki/Lipofuscin" title="Lipofuscin">lipofuscin</a> is formed by a complex reaction in cells that binds fat to proteins. Lipofuscin may accumulate in the cells as small granules during ageing.<a href="#cite_note-93">[93]</a>[<a href="/wiki/Wikipedia:Accuracy_dispute#Disputed_statement" title="Wikipedia:Accuracy dispute">dubious</a> – <a href="/wiki/Talk:Ageing#Dubious" title="Talk:Ageing">discuss</a>]</li> <li>The hallmark of ageing yeast cells appears to be overproduction of certain proteins.<a href="#cite_note-Janssens_2015-65">[65]</a></li> <li><a href="/wiki/Autophagy" title="Autophagy">Autophagy</a> induction can enhance clearance of toxic intracellular waste associated with neurodegenerative diseases and has been comprehensively demonstrated to improve lifespan in yeast, worms, flies, rodents and primates. The situation, however, has been complicated by the identification that autophagy up-regulation can also occur during ageing.<a href="#cite_note-Carroll_2013-94">[94]</a></li></ul></li> <li>Wear-and-tear theory: The general idea that changes associated with ageing are the result of chance damage that accumulates over time.<a href="#cite_note-Jin_2010-68">[68]</a></li> <li>Accumulation of errors: The idea that ageing results from chance events that escape proofreading mechanisms, which gradually damages the genetic code.[<a href="/wiki/Wikipedia:Identifying_reliable_sources_(medicine)" title="Wikipedia:Identifying reliable sources (medicine)">medical citation needed</a>]</li> <li><a href="/wiki/Heterochromatin" title="Heterochromatin">Heterochromatin</a> loss, model of ageing.<a href="#cite_note-95">[95]</a><a href="#cite_note-96">[96]</a></li> <li>Cross-linkage: The idea that ageing results from accumulation of <a href="/wiki/Cross-linked" class="mw-redirect" title="Cross-linked">cross-linked</a> compounds that interfere with normal cell function.<a href="#cite_note-97">[97]</a></li> <li>Studies of mtDNA mutator mice have shown that increased levels of somatic mtDNA mutations directly can cause a variety of ageing phenotypes. The authors propose that mtDNA mutations lead to respiratory-chain-deficient cells and thence to apoptosis and cell loss. They cast doubt experimentally however on the common assumption that mitochondrial mutations and dysfunction lead to increased generation of reactive oxygen species (ROS).<a href="#cite_note-98">[98]</a></li> <li><a href="/wiki/Free-radical_theory" class="mw-redirect" title="Free-radical theory">Free-radical theory</a>: Damage by <a href="/wiki/Free_radical" class="mw-redirect" title="Free radical">free radicals</a>, or more generally <a href="/wiki/Reactive_oxygen_species" title="Reactive oxygen species">reactive oxygen species</a> or <a href="/wiki/Oxidative_stress" title="Oxidative stress">oxidative stress</a>, create damage that may give rise to the symptoms we recognise as ageing.<a href="#cite_note-99">[99]</a> The effect of calorie restriction may be due to increased formation of free radicals within the <a href="/wiki/Mitochondria" class="mw-redirect" title="Mitochondria">mitochondria</a>, causing a secondary induction of increased <a href="/wiki/Antioxidant" title="Antioxidant">antioxidant</a> defence capacity.<a href="#cite_note-100">[100]</a></li> <li><a href="/wiki/Mitochondrial_theory_of_ageing" title="Mitochondrial theory of ageing">Mitochondrial theory of ageing</a>: <a href="/wiki/Free_radicals" class="mw-redirect" title="Free radicals">free radicals</a> produced by <a href="/wiki/Mitochondria" class="mw-redirect" title="Mitochondria">mitochondrial</a> activity damage cellular components, leading to ageing.</li> <li><a href="/wiki/8-Oxo-2%27-deoxyguanosine" title="8-Oxo-2'-deoxyguanosine">DNA oxidation</a> and caloric restriction: Caloric restriction reduces <a href="/wiki/8-Oxo-2%27-deoxyguanosine" title="8-Oxo-2'-deoxyguanosine">8-OH-dG</a> DNA damage in organs of ageing rats and mice.<a href="#cite_note-pmid11517304-101">[101]</a><a href="#cite_note-pmid15763395-102">[102]</a> Thus, reduction of oxidative DNA damage is associated with a slower rate of ageing and increased lifespan.<a href="#cite_note-103">[103]</a> In a 2021 review article, Vijg stated that "Based on an abundance of evidence, <a href="/wiki/DNA_damage_(naturally_occurring)" title="DNA damage (naturally occurring)">DNA damage</a> is now considered as the single most important driver of the degenerative processes that collectively cause ageing."<a href="#cite_note-vijg-104">[104]</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Research">Research</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=9" title="Edit section: Research">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Life_extension" title="Life extension">Life extension</a></div> <div class="mw-heading mw-heading3"><h3 id="Diet">Diet</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=10" title="Edit section: Diet">edit</a>]</div> The <a href="/wiki/Mediterranean_diet" title="Mediterranean diet">Mediterranean diet</a> is credited with lowering the risk of heart disease and early death.<a href="#cite_note-105">[105]</a><a href="#cite_note-pmid18786971-106">[106]</a> The major contributors to mortality risk reduction appear to be a higher consumption of vegetables, fish, fruits, nuts and monounsaturated fatty acids, such as by consuming olive oil.<a href="#cite_note-deGaetano2016-107">[107]</a> As of 2021, there is insufficient <a href="/wiki/Evidence-based_medicine" title="Evidence-based medicine">clinical evidence</a> that <a href="/wiki/Calorie_restriction" title="Calorie restriction">calorie restriction</a> or any dietary practice affects the process of ageing.<a href="#cite_note-lee-108">[108]</a> <div class="mw-heading mw-heading3"><h3 id="Exercise">Exercise</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=11" title="Edit section: Exercise">edit</a>]</div> People who participate in moderate to high levels of physical exercise have a lower mortality rate compared to individuals who are not physically active.<a href="#cite_note-109">[109]</a> The majority of the benefits from exercise are achieved with around 3500 <a href="/wiki/Metabolic_equivalent" class="mw-redirect" title="Metabolic equivalent">metabolic equivalent</a> (MET) minutes per week.<a href="#cite_note-BMJ2016-110">[110]</a> For example, climbing stairs 10 minutes, vacuuming 15 minutes, gardening 20 minutes, running 20 minutes, and walking or bicycling for 25 minutes on a daily basis would together achieve about 3000 MET minutes a week.<a href="#cite_note-BMJ2016-110">[110]</a> Exercise has also been found to be an effective measure to treat declines in neuromuscular function due to age. <a href="#cite_note-:0-111">[111]</a> A meta-analysis found that resistance training with elastic bands or kettlebells provided significant improvements to grip strength, gait speed, and skeletal muscle mass in patients with <a href="/wiki/Sarcopenia" title="Sarcopenia">sarcopenia</a>. <a href="#cite_note-:0-111">[111]</a> Furthermore, another analysis found that the positive effects of resistance exercise on strength, muscle mass, and motor coordination reduce the risk of falls in the elderly, which is a key factor for living a longer and healthier life. <a href="#cite_note-:1-112">[112]</a> In terms of programming, there is no one-size-fits-all approach. <a href="#cite_note-:0-111">[111]</a><a href="#cite_note-:1-112">[112]</a> General recommendations for improvements to gait speed, strength, and muscle size for reduced fall risk are resistance training programs with two to three 40-60 minute workouts per week, consisting of 1-2 sets of 5-8 repetitions of 2-3 different exercises for each major muscle group, but individual considerations must be taken due to differences in health status, motivation, and accessibility to exercise facilities. <a href="#cite_note-:0-111">[111]</a><a href="#cite_note-:1-112">[112]</a> There is also evidence to suggest that exercise of any type may mitigate the degradation of the <a href="/wiki/Neuromuscular_junction" title="Neuromuscular junction">neuromuscular junction</a> (NMJ) that occurs with age. <a href="#cite_note-:2-113">[113]</a> Current evidence suggests that aerobic exercise causes the most <a href="/wiki/Hypertrophy" title="Hypertrophy">hypertrophy</a> of the NMJ, although resistance training is still somewhat effective.<a href="#cite_note-:2-113">[113]</a> However, further evidence is necessary to identify optimal training protocols for NMJ function and to further understand how exercise affects the mechanisms that cause NMJ degradation.<a href="#cite_note-:2-113">[113]</a> <div class="mw-heading mw-heading3"><h3 id="Social_factors">Social factors</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=12" title="Edit section: Social factors">edit</a>]</div> A meta-analysis showed that loneliness carries a higher mortality risk than smoking.<a href="#cite_note-HoltLunstad2010-114">[114]</a> <div class="mw-heading mw-heading2"><h2 id="Society_and_culture">Society and culture</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=13" title="Edit section: Society and culture">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Aging_and_society" title="Aging and society">Aging and society</a></div><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Gerontology" title="Gerontology">Gerontology</a></div><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1235681985" /><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409" /> <div class="side-box-flex"> <div class="side-box-image"><a href="/wiki/File:Wiktionary-logo-en-v2.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/60px-Wiktionary-logo-en-v2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/120px-Wiktionary-logo-en-v2.svg.png 2x" data-file-width="512" data-file-height="512" /></a></div> <div class="side-box-text plainlist">Look up <a href="https://en.wiktionary.org/wiki/quadragenarian" class="extiw" title="wiktionary:quadragenarian">quadragenarian</a>, <a href="https://en.wiktionary.org/wiki/quinquagenarian" class="extiw" title="wiktionary:quinquagenarian">quinquagenarian</a>, <a href="https://en.wiktionary.org/wiki/sexagenarian" class="extiw" title="wiktionary:sexagenarian">sexagenarian</a>, <a href="https://en.wiktionary.org/wiki/septuagenarian" class="extiw" title="wiktionary:septuagenarian">septuagenarian</a>, <a href="https://en.wiktionary.org/wiki/octogenarian" class="extiw" title="wiktionary:octogenarian">octogenarian</a>, or <a href="https://en.wiktionary.org/wiki/nonagenarian" class="extiw" title="wiktionary:nonagenarian">nonagenarian</a> in Wiktionary, the free dictionary.</div></div> </div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Nowruz_2017_in_Bisaran,_Kurdistan_province.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Nowruz_2017_in_Bisaran%2C_Kurdistan_province.jpg/330px-Nowruz_2017_in_Bisaran%2C_Kurdistan_province.jpg" decoding="async" width="330" height="220" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Nowruz_2017_in_Bisaran%2C_Kurdistan_province.jpg/495px-Nowruz_2017_in_Bisaran%2C_Kurdistan_province.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Nowruz_2017_in_Bisaran%2C_Kurdistan_province.jpg/660px-Nowruz_2017_in_Bisaran%2C_Kurdistan_province.jpg 2x" data-file-width="3100" data-file-height="2067" /></a><figcaption>A grandmother and her grandchild</figcaption></figure> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:003_p4_dd.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/33/003_p4_dd.JPG/220px-003_p4_dd.JPG" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/33/003_p4_dd.JPG/330px-003_p4_dd.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/33/003_p4_dd.JPG/440px-003_p4_dd.JPG 2x" data-file-width="1024" data-file-height="768" /></a><figcaption>An elderly man</figcaption></figure> Different cultures express age in different ways. The age of an adult human is commonly measured in whole years since the day of birth. (The most notable exception—<a href="/wiki/East_Asian_age_reckoning" title="East Asian age reckoning">East Asian age reckoning</a>—is becoming less common, particularly in official contexts.) Arbitrary divisions set to mark periods of life may include <a href="/wiki/Minor_(law)" title="Minor (law)">juvenile</a> (from <a href="/wiki/Infant" title="Infant">infancy</a> through <a href="/wiki/Childhood" class="mw-redirect" title="Childhood">childhood</a>, <a href="/wiki/Preadolescence" title="Preadolescence">preadolescence</a>, and adolescence), <a href="/wiki/Emerging_adulthood_and_early_adulthood" title="Emerging adulthood and early adulthood">early adulthood</a>, <a href="/wiki/Middle_age" title="Middle age">middle adulthood</a>, and <a href="/wiki/Senior_citizen" class="mw-redirect" title="Senior citizen">late adulthood</a>. Informal[<a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed">citation needed</a>] terms include "<a href="/wiki/Tween_(demographic)" class="mw-redirect" title="Tween (demographic)">tweens</a>", "teenagers", "twentysomething", "thirtysomething", etc. as well as "denarian", "vicenarian", "tricenarian", "quadragenarian", etc. Most legal systems define a specific age for when an individual is allowed or obliged to do particular activities. These age specifications include <a href="/wiki/Voting_age" title="Voting age">voting age</a>, <a href="/wiki/Legal_drinking_age" title="Legal drinking age">drinking age</a>, <a href="/wiki/Age_of_consent" title="Age of consent">age of consent</a>, <a href="/wiki/Age_of_majority" title="Age of majority">age of majority</a>, <a href="/wiki/Age_of_criminal_responsibility" title="Age of criminal responsibility">age of criminal responsibility</a>, <a href="/wiki/Marriageable_age" title="Marriageable age">marriageable age</a>, <a href="/wiki/Age_of_candidacy" title="Age of candidacy">age of candidacy</a>, and <a href="/wiki/Mandatory_retirement_age" class="mw-redirect" title="Mandatory retirement age">mandatory retirement age</a>. Admission to a movie, for instance, may depend on age according to a <a href="/wiki/Motion_picture_rating_system" class="mw-redirect" title="Motion picture rating system">motion picture rating system</a>. A bus fare might be discounted for the young or old. Each nation, government, and non-governmental organization has different ways of classifying age. In other words, <a href="/wiki/Chronology" title="Chronology">chronological</a> ageing may be distinguished from "social ageing" (cultural age-expectations of how people should act as they grow older) and "biological ageing" (an organism's physical state as it ages).<a href="#cite_note-115">[115]</a> Ageism cost the United States $63 billion in one year according to a <a href="/wiki/Yale_School_of_Public_Health" title="Yale School of Public Health">Yale School of Public Health</a> study.<a href="#cite_note-116">[116]</a> In a UNFPA report about ageing in the 21st century, it highlighted the need to "Develop a new rights-based culture of ageing and a change of mindset and societal attitudes towards ageing and older persons, from welfare recipients to active, contributing members of society".<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> UNFPA said that this "requires, among others, working towards the development of international human rights instruments and their translation into national laws and regulations and affirmative measures that challenge age discrimination and recognise older people as autonomous subjects".<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> Older people's music participation contributes to the maintenance of interpersonal relationships and promoting successful ageing.<a href="#cite_note-118">[118]</a> At the same time, older persons can make contributions to society including caregiving and volunteering. For example, "A study of Bolivian migrants who [had] moved to Spain found that 69% left their children at home, usually with grandparents. In rural China, grandparents care for 38% of children aged under five whose parents have gone to work in cities."<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> <div class="mw-heading mw-heading3"><h3 id="Economics">Economics</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=14" title="Edit section: Economics">edit</a>]</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Population_ageing" title="Population ageing">Population ageing</a></div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:2017_world_map,_median_age_by_country.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b7/2017_world_map%2C_median_age_by_country.svg/400px-2017_world_map%2C_median_age_by_country.svg.png" decoding="async" width="400" height="205" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b7/2017_world_map%2C_median_age_by_country.svg/600px-2017_world_map%2C_median_age_by_country.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b7/2017_world_map%2C_median_age_by_country.svg/800px-2017_world_map%2C_median_age_by_country.svg.png 2x" data-file-width="864" data-file-height="443" /></a><figcaption>A map showing median age figures for 2017</figcaption></figure> Population ageing is the increase in the number and proportion of older people in society. Population ageing has three possible causes: migration, longer <a href="/wiki/Life_expectancy" title="Life expectancy">life expectancy</a> (decreased death rate) and decreased birth rate. Ageing has a significant impact on society. Young people tend to have fewer legal privileges (if they are below the <a href="/wiki/Age_of_majority" title="Age of majority">age of majority</a>), they are more likely to push for political and social change, to develop and adopt new technologies, and to need education. Older people have different requirements from society and government, and frequently have differing values as well, such as for property and pension rights.<a href="#cite_note-Vincent_2005-119">[119]</a> In the 21st century, one of the most significant population trends is ageing.<a href="#cite_note-120">[120]</a> Currently, over 11% of the world's current population are people aged 60 and older and the <a href="/wiki/United_Nations_Population_Fund" title="United Nations Population Fund">United Nations Population Fund</a> (UNFPA) estimates that by 2050 that number will rise to approximately 22%.<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> Ageing has occurred due to development which has enabled better nutrition, sanitation, health care, education and economic well-being. Consequently, fertility rates have continued to decline and life expectancy has risen. Life expectancy at birth is over 80 now in 33 countries. Ageing is a "global phenomenon", that is occurring fastest in developing countries, including those with large youth populations, and poses social and economic challenges to the work which can be overcome with "the right set of policies to equip individuals, families and societies to address these challenges and to reap its benefits".<a href="#cite_note-unfpa.org-121">[121]</a> As life expectancy rises and <a href="/wiki/Birth_rates" class="mw-redirect" title="Birth rates">birth rates</a> decline in developed countries, the <a href="/wiki/Median" title="Median">median</a> age rises accordingly. According to the United Nations, this process is taking place in nearly every country in the world.<a href="#cite_note-devrep05-122">[122]</a> A rising median age can have significant social and economic implications, as the workforce gets progressively older and the number of old workers and retirees grows relative to the number of young workers. Older people generally incur more health-related costs than do younger people in the workplace and can also cost more in worker's compensation and pension liabilities.<a href="#cite_note-aging-workforce-123">[123]</a> In most developed countries an older workforce is somewhat inevitable. In the United States for instance, the <a href="/wiki/Bureau_of_Labor_Statistics" title="Bureau of Labor Statistics">Bureau of Labor Statistics</a> estimates that one in four American workers will be 55 or older by 2020.<a href="#cite_note-aging-workforce-123">[123]</a>[<a href="/wiki/Wikipedia:Manual_of_Style/Dates_and_numbers#Chronological_items" title="Wikipedia:Manual of Style/Dates and numbers">needs update</a>] Among the most urgent concerns of older persons worldwide is income security. This poses challenges for governments with ageing populations to ensure investments in pension systems continues to provide economic independence and reduce poverty in old age. These challenges vary for developing and developed countries. UNFPA stated that, "Sustainability of these systems is of particular concern, particularly in developed countries, while social protection and old-age pension coverage remain a challenge for developing countries, where a large proportion of the labour force is found in the informal sector."<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> The global economic crisis has increased financial pressure to ensure economic security and access to health care in old age. To elevate this pressure "social protection floors must be implemented in order to guarantee income security and access to essential health and social services for all older persons and provide a safety net that contributes to the postponement of disability and prevention of impoverishment in old age".<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> It has been argued that population ageing has undermined economic development<a href="#cite_note-Basakha_2015-124">[124]</a> and can lead to lower inflation because elderly individuals care especially strongly about the value of their pensions and savings. Evidence suggests that pensions, while making a difference to the well-being of older persons, also benefit entire families especially in times of crisis when there may be a shortage or loss of employment within households. A study by the Australian Government in 2003 estimated that "women between the ages of 65 and 74 years contribute A$16 billion per year in unpaid caregiving and voluntary work. Similarly, men in the same age group contributed A$10 billion per year."<a href="#cite_note-Ageing_in_the_Twenty-First_Century-117">[117]</a> Due to increasing share of the elderly in the population, health care expenditures will continue to grow relative to the economy in coming decades. This has been considered as a negative phenomenon and effective strategies like labour productivity enhancement should be considered to deal with negative consequences of ageing.<a href="#cite_note-Basakha_2014-125">[125]</a> <div class="mw-heading mw-heading3"><h3 id="Sociology">Sociology</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=15" title="Edit section: Sociology">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Menneske_Aldrene_(C._W._Eckersberg).png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Menneske_Aldrene_%28C._W._Eckersberg%29.png/220px-Menneske_Aldrene_%28C._W._Eckersberg%29.png" decoding="async" width="220" height="183" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/55/Menneske_Aldrene_%28C._W._Eckersberg%29.png/330px-Menneske_Aldrene_%28C._W._Eckersberg%29.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/55/Menneske_Aldrene_%28C._W._Eckersberg%29.png/440px-Menneske_Aldrene_%28C._W._Eckersberg%29.png 2x" data-file-width="1120" data-file-height="931" /></a><figcaption><a href="/wiki/Christoffer_Wilhelm_Eckersberg" title="Christoffer Wilhelm Eckersberg">Christoffer Wilhelm Eckersberg</a>: Ages of Man</figcaption></figure> In the field of sociology and mental health, ageing is seen in five different views: ageing as <a href="/wiki/Maturity_(psychological)" title="Maturity (psychological)">maturity</a>, ageing as decline, ageing as a life-cycle event, ageing as generation, and ageing as survival.<a href="#cite_note-126">[126]</a> Positive correlates with ageing often include economics, employment, marriage, children, education, and sense of control, as well as many others. The <a href="/wiki/Social_science_of_aging" class="mw-redirect" title="Social science of aging">social science of ageing</a> includes disengagement theory, activity theory, selectivity theory, and continuity theory. Retirement, a common transition faced by the elderly, may have both positive and negative consequences.<a href="#cite_note-127">[127]</a> As cyborgs currently are on the rise<a href="#cite_note-128">[128]</a> some theorists argue there is a need to develop new definitions of ageing and for instance a bio-techno-social definition of ageing has been suggested.<a href="#cite_note-pmid25456627-129">[129]</a> There is a current debate as to whether or not the pursuit of <a href="/wiki/Longevity" title="Longevity">longevity</a> and the postponement of senescence are cost-effective health care goals given finite health care resources. Because of the accumulated infirmities of old age, bioethicist <a href="/wiki/Ezekiel_Emanuel" title="Ezekiel Emanuel">Ezekiel Emanuel</a>, opines that the pursuit of longevity via the <a href="/wiki/Compression_of_morbidity" title="Compression of morbidity">compression of morbidity</a> hypothesis is a "fantasy" and that human life is not worth living after age 75; longevity then should not be a goal of health care policy.<a href="#cite_note-Emmanuel-130">[130]</a> This opinion has been contested by neurosurgeon and medical ethicist <a href="/wiki/Miguel_Faria" class="mw-redirect" title="Miguel Faria">Miguel Faria</a>, who states that life can be worthwhile during old age, and that longevity should be pursued in association with the attainment of quality of life.<a href="#cite_note-Faria_75-131">[131]</a> Faria claims that postponement of senescence as well as happiness and wisdom can be attained in old age in a large proportion of those who lead healthy lifestyles and remain intellectually active.<a href="#cite_note-Faria_longevity-132">[132]</a> <div class="mw-heading mw-heading3"><h3 id="Health_care_demand">Health care demand</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=16" title="Edit section: Health care demand">edit</a>]</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Healthcare_expenditures_in_Japan_by_Age.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Healthcare_expenditures_in_Japan_by_Age.svg/330px-Healthcare_expenditures_in_Japan_by_Age.svg.png" decoding="async" width="330" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Healthcare_expenditures_in_Japan_by_Age.svg/495px-Healthcare_expenditures_in_Japan_by_Age.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Healthcare_expenditures_in_Japan_by_Age.svg/660px-Healthcare_expenditures_in_Japan_by_Age.svg.png 2x" data-file-width="900" data-file-height="450" /></a><figcaption>Health care demand by age (2020, Japan, <a href="/wiki/Ministry_of_Health,_Labour_and_Welfare" title="Ministry of Health, Labour and Welfare">MHLW</a>)</figcaption></figure> With age inevitable biological changes occur that increase the risk of illness and disability. UNFPA states that:<a href="#cite_note-unfpa.org-121">[121]</a> "A life-cycle approach to health care – one that starts early, continues through the reproductive years and lasts into old age – is essential for the physical and emotional well-being of older persons, and, indeed, all people. Public policies and programmes should additionally address the needs of older impoverished people who cannot afford health care." Many societies in Western Europe and Japan have ageing populations. While the effects on society are complex, there is a concern about the impact on health care demand. The large number of suggestions in the literature for specific interventions to cope with the expected increase in demand for long-term care in ageing societies can be organized under four headings: improve system performance; redesign service delivery; support informal caregivers; and shift demographic parameters.<a href="#cite_note-Saltman2006-133">[133]</a> However, the annual growth in national health spending is not mainly due to increasing demand from ageing populations, but rather has been driven by rising incomes, costly new medical technology, a shortage of health care workers and informational asymmetries between providers and patients.<a href="#cite_note-Rheinhardt2003-134">[134]</a> A number of health problems become more prevalent as people get older. These include mental health problems as well as physical health problems, especially <a href="/wiki/Dementia" title="Dementia">dementia</a>. It has been estimated that population ageing only explains 0.2 percentage points of the annual growth rate in medical spending of 4.3% since 1970. In addition, certain reforms to the Medicare system in the United States decreased elderly spending on home health care by 12.5% per year between 1996 and 2000.<a href="#cite_note-Meara2004.-135">[135]</a> <div class="mw-heading mw-heading3"><h3 id="Self-perception">Self-perception</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=17" title="Edit section: Self-perception">edit</a>]</div> <a href="/wiki/Beauty_standards" class="mw-redirect" title="Beauty standards">Beauty standards</a> have evolved over time, and as scientific research in cosmeceuticals, cosmetic products seen to have medicinal benefits like anti-ageing creams, has increased, the industry has also expanded; the kinds of products they produce (such as serums and creams) have gradually gained popularity and become a part of many people's personal care routine.<a href="#cite_note-136">[136]</a> The increase in demand for cosmeceuticals has led scientists to find ingredients for these products in unorthodox places. For example, the secretion of cryptomphalus aspersa (or brown garden snail) has been found to have antioxidant properties, increase skin cell proliferation, and increase extracellular proteins such as collagen and fibronectin (important proteins for cell proliferation).<a href="#cite_note-137">[137]</a> Another substance used to prevent the physical manifestations of ageing is onobotulinumtoxinA, the toxin injected for Botox.<a href="#cite_note-138">[138]</a> In some cultures, old age is celebrated and honoured. In Korea, for example, a special party called <a href="/wiki/Hwangap" class="mw-redirect" title="Hwangap">hwangap</a> is held to celebrate and congratulate an individual for turning 60 years old.<a href="#cite_note-139">[139]</a> In China, respect for elderly is often the basis for how a community is organized and has been at the foundation of Chinese culture and morality for thousands of years. Older people are respected for their wisdom and most important decisions have traditionally not been made without consulting them. This is a similar case for most Asian countries such as the Philippines, Thailand, Vietnam, Singapore, etc. Positive self-perceptions of ageing are associated with better mental and physical health and well-being.<a href="#cite_note-Sabatini2019-140">[140]</a> Positive <a href="/wiki/Self-rated_health" title="Self-rated health">self-perception of health</a> has been correlated with higher well-being and reduced mortality among the elderly.<a href="#cite_note-Idler2003-141">[141]</a><a href="#cite_note-Deeg2003-142">[142]</a> Various reasons have been proposed for this association; people who are objectively healthy may naturally rate their health better as than that of their ill counterparts, though this link has been observed even in studies which have controlled for <a href="/wiki/Socioeconomic_status" title="Socioeconomic status">socioeconomic status</a>, psychological functioning and health status.<a href="#cite_note-Benyamini2003-143">[143]</a> This finding is generally stronger for men than women,<a href="#cite_note-Deeg2003-142">[142]</a> though this relationship is not universal across all studies and may only be true in some circumstances.<a href="#cite_note-Benyamini2003-143">[143]</a> As people age, subjective health remains relatively stable, even though objective health worsens.<a href="#cite_note-Kunz2000-144">[144]</a> In fact, perceived health improves with age when objective health is controlled in the equation.<a href="#cite_note-145">[145]</a> This phenomenon is known as the "paradox of ageing". This may be a result of <a href="/wiki/Social_comparison" class="mw-redirect" title="Social comparison">social comparison</a>;<a href="#cite_note-146">[146]</a> for instance, the older people get, the more they may consider themselves in better health than their same-aged peers.<a href="#cite_note-147">[147]</a> Elderly people often associate their functional and physical decline with the normal ageing process.<a href="#cite_note-148">[148]</a><a href="#cite_note-149">[149]</a> One way to help younger people experience what it feels like to be older is through an <a href="/wiki/Ageing_suit" title="Ageing suit">ageing suit</a>. There are several different kinds of suits including the GERT (named as a reference to <a href="/wiki/Gerontology" title="Gerontology">gerontology</a>), the R70i exoskeleton, and the AGNES (Age Gain Now Empathy Suit) suits.<a href="#cite_note-www.wbur.org-150">[150]</a><a href="#cite_note-151">[151]</a><a href="#cite_note-agelab.mit.edu-152">[152]</a> These suits create the feelings of the effects of ageing by adding extra weight and increased pressure in certain points like the wrists, ankles and other joints. In addition, the various suits have different ways to impair vision and hearing to simulate the loss of these senses. To create the loss of feeling in hands that the elderly experience, special gloves are a part of the uniforms. Use of these suits may help to increase the amount of empathy felt for the elderly and could be considered particularly useful for those who are either learning about ageing, or those who work with the elderly, such as nurses or care centre staff. Design is another field that could benefit from the empathy these suits may cause.<a href="#cite_note-www.wbur.org-150">[150]</a><a href="#cite_note-agelab.mit.edu-152">[152]</a> When designers understand what it feels like to have the impairments of old age, they can better design buildings, packaging, or even tools to help with the simple day-to-day tasks that are more difficult with less dexterity. Designing with the elderly in mind may help to reduce the negative feelings that are associated with the loss of abilities that the elderly face. <div class="mw-heading mw-heading3"><h3 id="Healthy_ageing">Healthy ageing</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=18" title="Edit section: Healthy ageing">edit</a>]</div> The healthy ageing framework, proposed by the World Health Organization <a href="#cite_note-auto-153">[153]</a> operationalizes health as functional ability, which results from the interactions of intrinsic capacity and the environments. <div class="mw-heading mw-heading4"><h4 id="Intrinsic_capacity">Intrinsic capacity</h4>[<a href="/w/index.php?title=Ageing&action=edit&section=19" title="Edit section: Intrinsic capacity">edit</a>]</div> Intrinsic capacity is a construct encompassing people's physical and mental abilities which can be drawn upon during ageing. <a href="#cite_note-auto-153">[153]</a> Intrinsic capacity comprises the domains of: cognition, locomotion, vitality/nutrition, psychological and sensory (visual and hearing). <a href="#cite_note-154">[154]</a> A recent study found four "profiles" or "statuses" of intrinsic capacity among older adults, namely high IC (43% at baseline), low deterioration with impaired locomotion (17%), high deterioration without cognitive impairment (22%) and high deterioration with cognitive impairment (18%). Over half of the study sample remained in the same status at baseline and follow-up (61%). Around one-fourth of participants transitioned from the high IC to the low deterioration status, and only 3% of the participants improved their status. Interestingly, the probability of improvement was observed in the status of high deterioration. Participants in the latent statuses of low and high levels of deterioration had a significantly higher risk of frailty, disability and dementia than their high IC counterparts.<a href="#cite_note-155">[155]</a> <div class="mw-heading mw-heading3"><h3 id="Successful_aging">Successful aging</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=20" title="Edit section: Successful aging">edit</a>]</div> The concept of successful aging can be traced back to the 1950s and was popularized in the 1980s. Traditional definitions of successful aging have emphasized absence of physical and cognitive disabilities.<a href="#cite_note-156">[156]</a> In their 1987 article, Rowe and Kahn characterized successful aging as involving three components: a) freedom from disease and disability, b) high cognitive and physical functioning, and c) social and productive engagement.<a href="#cite_note-Human_aging:_Usual_and_successful-157">[157]</a> The study cited previous was also done back in 1987 and therefore, these factors associated with successful aging have probably been changed. With the current knowledge, scientists started to focus on learning about the effect spirituality in successful aging. There are some differences in cultures as to which of these components are the most important. Most often across cultures, social engagement was the most highly rated but depending on the culture the definition of successful aging changes.<a href="#cite_note-158">[158]</a> <div class="mw-heading mw-heading3"><h3 id="Cultural_references">Cultural references</h3>[<a href="/w/index.php?title=Ageing&action=edit&section=21" title="Edit section: Cultural references">edit</a>]</div> The ancient Greek dramatist <a href="/wiki/Euripides" title="Euripides">Euripides</a> (5th century BC) describes the multiple-headed mythological monster <a href="/wiki/Lernaean_Hydra" title="Lernaean Hydra">Hydra</a> as having a regenerative capacity which makes it immortal, which is the historical background to the name of the biological genus <a href="/wiki/Hydra_(genus)" title="Hydra (genus)">Hydra</a>. The <a href="/wiki/Book_of_Job" title="Book of Job">Book of Job</a> (c. 6th century BC) describes the human lifespan as inherently limited and makes a comparison with the innate immortality that a felled tree may have when undergoing vegetative regeneration:<style data-mw-deduplicate="TemplateStyles:r1244412712">.mw-parser-output .templatequote{overflow:hidden;margin:1em 0;padding:0 32px}.mw-parser-output .templatequotecite{line-height:1.5em;text-align:left;margin-top:0}@media(min-width:500px){.mw-parser-output .templatequotecite{padding-left:1.6em}}</style><blockquote class="templatequote">A man's days are numbered. You know the number of his months. He cannot live longer than the time You have set. So now look away from him that he may rest, until he has lived the time set for him like a man paid to work. For there is hope for a tree, when it is cut down, that it will grow again, and that its branches will not stop growing.<a href="#cite_note-159">[159]</a></blockquote> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=22" title="Edit section: See also">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 18em;"> <ul><li><a href="/wiki/Ageing_brain" class="mw-redirect" title="Ageing brain">Ageing brain</a></li> <li><a href="/wiki/Ageing_movement_control" class="mw-redirect" title="Ageing movement control">Ageing movement control</a></li> <li><a href="/wiki/Ageing_of_Europe" title="Ageing of Europe">Ageing of Europe</a></li> <li><a href="/wiki/Ageing_studies" title="Ageing studies">Ageing studies</a></li> <li><a href="/wiki/Anti-ageing_movement" class="mw-redirect" title="Anti-ageing movement">Anti-ageing movement</a></li> <li><a href="/wiki/Biodemography_of_human_longevity" title="Biodemography of human longevity">Biodemography of human longevity</a></li> <li><a href="/wiki/Biogerontology" title="Biogerontology">Biogerontology</a></li> <li><a href="/wiki/Biological_immortality" title="Biological immortality">Biological immortality</a></li> <li><a href="/wiki/Biomarkers_of_ageing" class="mw-redirect" title="Biomarkers of ageing">Biomarkers of ageing</a></li> <li><a href="/wiki/Clinical_geropsychology" title="Clinical geropsychology">Clinical geropsychology</a></li> <li><a href="/wiki/Death" title="Death">Death</a></li> <li><a href="/wiki/DNA_damage_theory_of_aging" title="DNA damage theory of aging">DNA damage theory of aging</a></li> <li><a href="/wiki/Epigenetic_clock" title="Epigenetic clock">Epigenetic clock</a></li> <li><a href="/wiki/Evolution_of_ageing" title="Evolution of ageing">Evolution of ageing</a></li> <li><a href="/wiki/Genetics_of_ageing" class="mw-redirect" title="Genetics of ageing">Genetics of ageing</a></li> <li><a href="/wiki/Gerontechnology" title="Gerontechnology">Gerontechnology</a></li> <li><a href="/wiki/Gerontology" title="Gerontology">Gerontology</a></li> <li><a href="/wiki/Gerascophobia" title="Gerascophobia">Gerascophobia</a></li> <li><a href="/wiki/List_of_life_extension-related_topics" class="mw-redirect" title="List of life extension-related topics">List of life extension-related topics</a></li> <li><a href="/wiki/Longevity" title="Longevity">Longevity</a></li> <li><a href="/wiki/Mitochondrial_theory_of_ageing" title="Mitochondrial theory of ageing">Mitochondrial theory of ageing</a></li> <li><a href="/wiki/Neuroscience_of_ageing" class="mw-redirect" title="Neuroscience of ageing">Neuroscience of ageing</a></li> <li><a href="/wiki/Old_age" title="Old age">Old age</a></li> <li><a href="/wiki/Old_person_smell" title="Old person smell">Old person smell</a></li> <li><a href="/wiki/Particulates" title="Particulates">Particulates</a></li> <li><a href="/wiki/Pollutants" class="mw-redirect" title="Pollutants">Pollutants</a></li> <li><a href="/wiki/Population_ageing" title="Population ageing">Population ageing</a></li> <li><a href="/wiki/Progeria" title="Progeria">Progeria</a></li> <li><a href="/wiki/Rejuvenation" title="Rejuvenation">Rejuvenation</a></li> <li><a href="/wiki/Stem_cell_theory_of_ageing" class="mw-redirect" title="Stem cell theory of ageing">Stem cell theory of ageing</a></li> <li><a href="/wiki/Supercentenarian" title="Supercentenarian">Supercentenarian</a></li> <li><a href="/wiki/Thermoregulation_in_humans" class="mw-redirect" title="Thermoregulation in humans">Thermoregulation in humans</a></li> <li><a href="/wiki/Transgenerational_design" title="Transgenerational design">Transgenerational design</a></li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2>[<a href="/w/index.php?title=Ageing&action=edit&section=23" title="Edit section: References">edit</a>]</div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><a href="#cite_ref-1">^</a> <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration 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Retrieved 12 March 2021.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=digitaltrends&rft.atitle=Hands+on%3A+Genworth+R70i+Exoskeleton&rft.date=2016-01-07&rft.aulast=Prindle&rft.aufirst=D&rft_id=https%3A%2F%2Fwww.digitaltrends.com%2Fcool-tech%2Fgenworth-r70i-exoskeleton%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAgeing" class="Z3988"> </li> <li id="cite_note-agelab.mit.edu-152">^ <a href="#cite_ref-agelab.mit.edu_152-0">a</a> <a href="#cite_ref-agelab.mit.edu_152-1">b</a> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20210406035347/https://agelab.mit.edu/agnes-age-gain-now-empathy-system#:~:text=AGNES%20is%20a%20suit%20worn,physical%20challenges%20associated%20with%20aging">"AGNES (Age Gain Now Empathy System) | MIT AgeLab"</a>. agelab.mit.edu. 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Innovation in Aging. 2 (Suppl 1): 167. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fgeroni%2Figy023.601">10.1093/geroni/igy023.601</a>. <a href="/wiki/ISSN_(identifier)" class="mw-redirect" title="ISSN (identifier)">ISSN</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/issn/2399-5300">2399-5300</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a> <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6229246">6229246</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Innovation+in+Aging&rft.atitle=Successful+Aging%3A+Cross-Cultural+Comparison+of+Older+Adults%27+Lay+Perspectives&rft.volume=2&rft.issue=Suppl+1&rft.pages=167&rft.date=2018-11-11&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6229246%23id-name%3DPMC&rft.issn=2399-5300&rft_id=info%3Adoi%2F10.1093%2Fgeroni%2Figy023.601&rft.aulast=Jensen&rft.aufirst=A&rft.au=Claunch%2C+K&rft.au=Verdeja%2C+M&rft.au=Dungan%2C+M&rft.au=Goates%2C+M&rft.au=Thacker%2C+E&rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC6229246&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAgeing" class="Z3988"> </li> <li id="cite_note-159"><a href="#cite_ref-159">^</a> <a rel="nofollow" class="external text" href="https://www.biblegateway.com/passage/?search=Job+14:5–7&version=nlv">Job 14:5–7</a>: <a href="/wiki/New_Life_Version" title="New Life Version">New Life Version</a> </li> </ol></div></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1235681985" /><style data-mw-deduplicate="TemplateStyles:r1250146164">.mw-parser-output .sister-box .side-box-abovebelow{padding:0.75em 0;text-align:center}.mw-parser-output .sister-box .side-box-abovebelow>b{display:block}.mw-parser-output .sister-box .side-box-text>ul{border-top:1px solid #aaa;padding:0.75em 0;width:217px;margin:0 auto}.mw-parser-output .sister-box .side-box-text>ul>li{min-height:31px}.mw-parser-output .sister-logo{display:inline-block;width:31px;line-height:31px;vertical-align:middle;text-align:center}.mw-parser-output .sister-link{display:inline-block;margin-left:4px;width:182px;vertical-align:middle}@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-v2.svg"]{background-color:white}}</style><div role="navigation" aria-labelledby="sister-projects" class="side-box metadata side-box-right sister-box sistersitebox plainlinks"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1126788409" /> <div class="side-box-abovebelow"> Ageing at Wikipedia's <a href="/wiki/Wikipedia:Wikimedia_sister_projects" title="Wikipedia:Wikimedia sister projects">sister projects</a></div> <div class="side-box-flex"> <div class="side-box-text plainlist"><ul><li><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/0/06/Wiktionary-logo-v2.svg/40px-Wiktionary-logo-v2.svg.png" decoding="async" width="27" height="27" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/0/06/Wiktionary-logo-v2.svg/60px-Wiktionary-logo-v2.svg.png 1.5x" data-file-width="391" data-file-height="391" /><a href="https://en.wiktionary.org/wiki/Special:Search/Ageing" class="extiw" title="wikt:Special:Search/Ageing">Definitions</a> from Wiktionary</li><li><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/20px-Commons-logo.svg.png" decoding="async" width="20" height="27" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/40px-Commons-logo.svg.png 1.5x" data-file-width="1024" data-file-height="1376" /><a href="https://commons.wikimedia.org/wiki/Category:Ageing" class="extiw" title="c:Category:Ageing">Media</a> from Commons</li><li><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/23px-Wikiquote-logo.svg.png" decoding="async" width="23" height="27" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/35px-Wikiquote-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikiquote-logo.svg/46px-Wikiquote-logo.svg.png 2x" data-file-width="300" data-file-height="355" /><a href="https://en.wikiquote.org/wiki/Special:Search/Ageing" class="extiw" title="q:Special:Search/Ageing">Quotations</a> from Wikiquote</li><li><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikibooks-logo.svg/27px-Wikibooks-logo.svg.png" decoding="async" width="27" height="27" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikibooks-logo.svg/41px-Wikibooks-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Wikibooks-logo.svg/54px-Wikibooks-logo.svg.png 2x" data-file-width="300" data-file-height="300" /><a href="https://en.wikibooks.org/wiki/Introduction_to_Sociology/Aging" class="extiw" title="b:Introduction to Sociology/Aging">Textbooks</a> from Wikibooks</li><li><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/27px-Wikidata-logo.svg.png" decoding="async" width="27" height="15" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/41px-Wikidata-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/ff/Wikidata-logo.svg/54px-Wikidata-logo.svg.png 2x" data-file-width="1050" data-file-height="590" /><a href="https://www.wikidata.org/wiki/Q332154" class="extiw" title="d:Q332154">Data</a> from Wikidata</li></ul></div></div> </div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><style data-mw-deduplicate="TemplateStyles:r1236075235">.mw-parser-output .navbox{box-sizing:border-box;border:1px solid #a2a9b1;width:100%;clear:both;font-size:88%;text-align:center;padding:1px;margin:1em auto 0}.mw-parser-output .navbox .navbox{margin-top:0}.mw-parser-output .navbox+.navbox,.mw-parser-output .navbox+.navbox-styles+.navbox{margin-top:-1px}.mw-parser-output .navbox-inner,.mw-parser-output .navbox-subgroup{width:100%}.mw-parser-output .navbox-group,.mw-parser-output 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.navbox-even{background-color:#f7f7f7}.mw-parser-output .navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Developmental_biology25" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background: thistle"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231" /><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Developmental_biology" title="Template:Developmental biology"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Developmental_biology" title="Template talk:Developmental biology"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Developmental_biology" title="Special:EditPage/Template:Developmental biology"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Developmental_biology25" style="font-size:114%;margin:0 4em"><a href="/wiki/Developmental_biology" title="Developmental biology">Developmental biology</a></div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Ageing</a></li> <li><a href="/wiki/Compartment_(development)" title="Compartment (development)">Compartment</a></li> <li><a href="/wiki/Embryogenesis" class="mw-redirect" title="Embryogenesis">Embryogenesis</a> <ul><li><a href="/wiki/Human_embryogenesis" class="mw-redirect" title="Human embryogenesis">Human</a></li> <li><a href="/wiki/Drosophila_embryogenesis" title="Drosophila embryogenesis">Drosophila</a></li> <li><a href="/wiki/Fish_development" title="Fish development">Fish</a></li> <li><a href="/wiki/Polarity_in_embryogenesis" title="Polarity in embryogenesis">polarity</a></li></ul></li> <li><a href="/wiki/Embryology" title="Embryology">Embryology</a></li> <li><a href="/wiki/Metamerism_(biology)" title="Metamerism (biology)">Metamerism</a></li> <li><a href="/wiki/Larva" title="Larva">Larva</a></li> <li><a href="/wiki/Pupa" title="Pupa">Pupa</a></li> <li><a href="/wiki/Metamorphosis" title="Metamorphosis">Metamorphosis</a> <ul><li>Indirect development: <a href="/wiki/Holometabolism" title="Holometabolism">holometabolism</a> (<a href="/wiki/Hypermetamorphosis" title="Hypermetamorphosis">Hypermetamorphosis</a>), <a href="/wiki/Hemimetabolism" title="Hemimetabolism">hemimetabolism</a></li> <li><a href="/wiki/Direct_development" title="Direct development">Direct development</a>: <a href="/wiki/Ametabolism" title="Ametabolism">ametabolism</a></li></ul></li> <li><a href="/wiki/Model_organism" title="Model organism">Model organisms</a></li> <li><a href="/wiki/Ontogeny" title="Ontogeny">Ontogeny</a></li> <li><a href="/wiki/Puberty" title="Puberty">Puberty</a></li> <li><a href="/wiki/Regeneration_(biology)" title="Regeneration (biology)">Regeneration</a> <ul><li><a href="/wiki/Regeneration_in_humans" title="Regeneration in humans">Human</a></li></ul></li> <li><a href="/wiki/Teratology" title="Teratology">Teratology</a></li></ul> </div></td></tr><tr><td colspan="2" class="navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Evolutionary_developmental_biology" title="Evolutionary developmental biology">Evolutionary developmental biology</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235" /></div><div role="navigation" class="navbox" aria-labelledby="Development_of_the_human_body82" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231" /><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Human_development" title="Template:Human development"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Human_development" title="Template talk:Human development"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Human_development" title="Special:EditPage/Template:Human development"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Development_of_the_human_body82" style="font-size:114%;margin:0 4em"><a href="/wiki/Development_of_the_human_body" title="Development of the human body">Development of the human body</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Before birth</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Prenatal_development" title="Prenatal development">Development</a></li> <li><a href="/wiki/Zygote" title="Zygote">Zygote</a></li> <li><a href="/wiki/Embryo" title="Embryo">Embryo</a></li> <li><a href="/wiki/Fetus" title="Fetus">Fetus</a></li> <li><a href="/wiki/Gestational_age_(obstetrics)" class="mw-redirect" title="Gestational age (obstetrics)">Gestational age</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Birth and after</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Childbirth" title="Childbirth">Birth</a></li> <li><a href="/wiki/Child_development" title="Child development">Child development</a> <ul><li><a href="/wiki/Child_development_stages" title="Child development stages">Stages</a></li> <li><a href="/wiki/Early_childhood_development" title="Early childhood development">Early</a></li> <li><a href="/wiki/Puberty" title="Puberty">Puberty</a></li></ul></li> <li><a href="/wiki/Adult_development" title="Adult development">Adult development</a></li> <li><a class="mw-selflink selflink">Ageing</a></li> <li><a href="/wiki/Senescence" title="Senescence">Senescence</a></li> <li><a href="/wiki/Death" title="Death">Death</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Phases</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li>Early years <ul><li><a href="/wiki/Infant" title="Infant">Infant</a></li> <li><a href="/wiki/Toddler" title="Toddler">Toddler</a></li> <li><a href="/wiki/Early_childhood" title="Early childhood">Early childhood</a></li> <li><a href="/wiki/Childhood" class="mw-redirect" title="Childhood">Childhood</a> <ul><li><a href="/wiki/Child" title="Child">Child</a></li></ul></li></ul></li> <li><a href="/wiki/Youth" title="Youth">Youth</a> <ul><li><a href="/wiki/Preadolescence" title="Preadolescence">Preadolescence</a></li> <li><a href="/wiki/Adolescence" title="Adolescence">Adolescence</a></li> <li><a href="/wiki/Emerging_adulthood_and_early_adulthood" title="Emerging adulthood and early adulthood">Emerging adulthood</a></li></ul></li> <li><a href="/wiki/Adult" title="Adult">Adulthood</a> <ul><li><a href="/wiki/Young_adult" title="Young adult">Young adult</a></li> <li><a href="/wiki/Middle_age" title="Middle age">Middle adult</a></li> <li><a href="/wiki/Old_age" title="Old age">Elder adult</a></li></ul></li> <li><a href="/wiki/Dying" title="Dying">Dying</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Social and legal</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Minor_(law)" title="Minor (law)">Minor</a></li> <li><a href="/wiki/Age_of_majority" title="Age of majority">Age of majority</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235" /></div><div role="navigation" class="navbox" aria-labelledby="Longevity116" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231" /><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Longevity" title="Template:Longevity"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Longevity" title="Template talk:Longevity"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Longevity" title="Special:EditPage/Template:Longevity"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Longevity116" style="font-size:114%;margin:0 4em"><a href="/wiki/Longevity" title="Longevity">Longevity</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a class="mw-selflink selflink">Ageing</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Old_age" title="Old age">Old age</a></li> <li><a href="/wiki/Longevity_myths" title="Longevity myths">Longevity myths</a></li> <li><a href="/wiki/Senescence" title="Senescence">Senescence</a> <ul><li><a href="/wiki/Aging-associated_diseases" title="Aging-associated diseases">aging-associated diseases</a></li> <li><a href="/wiki/Degenerative_disease" title="Degenerative disease">degenerative diseases</a></li> <li><a href="/wiki/Negligible_senescence" title="Negligible senescence">negligible senescence</a></li></ul></li> <li><a href="/wiki/Gerontology" title="Gerontology">Gerontology</a> <ul><li><a href="/wiki/Biogerontology" title="Biogerontology">biogerontology</a></li> <li><a href="/wiki/Cognitive_epidemiology" title="Cognitive epidemiology">cognitive epidemiology</a></li></ul></li> <li><a href="/wiki/Centenarian" title="Centenarian">Centenarian</a> <ul><li><a href="/wiki/Supercentenarian" title="Supercentenarian">supercentenarian</a></li> <li><a href="/wiki/Research_into_centenarians" title="Research into centenarians">research into centenarians</a></li></ul></li> <li><a href="/wiki/Life_expectancy" title="Life expectancy">Life expectancy</a> <ul><li><a href="/wiki/LGBT_life_expectancy" title="LGBT life expectancy">LGBT life expectancy</a></li></ul></li> <li><a href="/wiki/Maximum_life_span" title="Maximum life span">Maximum life span</a></li> <li><a href="/wiki/Biomarkers_of_aging" title="Biomarkers of aging">Biomarkers of aging</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Life_extension" title="Life extension">Life extension</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Outline_of_life_extension" title="Outline of life extension">Topic outline</a> <ul><li><a href="/wiki/Index_of_topics_related_to_life_extension" title="Index of topics related to life extension">index</a></li></ul></li> <li><a href="/wiki/Anti-aging_movement" title="Anti-aging movement">Anti-aging movement</a></li> <li><a href="/wiki/Biodemography_of_human_longevity" title="Biodemography of human longevity">Biodemography of human longevity</a></li> <li><a href="/wiki/Life_extension" title="Life extension">Indefinite lifespan</a></li> <li><a href="/wiki/Longevity_escape_velocity" title="Longevity escape velocity">Longevity escape velocity</a></li> <li>Methods <ul><li><a href="/wiki/Calorie_restriction" title="Calorie restriction">calorie restriction</a></li> <li><a href="/wiki/Diet_and_longevity" class="mw-redirect" title="Diet and longevity">Diet and longevity</a></li> <li><a href="/wiki/Gene_therapy" title="Gene therapy">gene therapy</a></li> <li><a href="/wiki/Nanomedicine" title="Nanomedicine">nanomedicine</a></li> <li><a href="/wiki/Organ_printing" title="Organ printing">organ printing</a></li> <li><a href="/wiki/Rejuvenation" title="Rejuvenation">rejuvenation</a></li> <li><a href="/wiki/Stem-cell_therapy" title="Stem-cell therapy">stem-cell therapy</a></li> <li><a href="/wiki/Strategies_for_engineered_negligible_senescence" title="Strategies for engineered negligible senescence">SENS</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Lists of <a href="/wiki/Life_expectancy" title="Life expectancy">life expectancy</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">by country</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_countries_by_life_expectancy" title="List of countries by life expectancy">World</a></li> <li><a href="/wiki/List_of_African_countries_by_life_expectancy" title="List of African countries by life expectancy">Africa</a></li> <li><a href="/wiki/List_of_countries_in_the_Americas_by_life_expectancy" title="List of countries in the Americas by life expectancy">Americas</a> <ul><li><a href="/wiki/List_of_North_American_countries_by_life_expectancy" title="List of North American countries by life expectancy">North America</a></li> <li><a href="/wiki/List_of_South_American_countries_by_life_expectancy" title="List of South American countries by life expectancy">South America</a></li></ul></li> <li><a href="/wiki/List_of_Asian_countries_by_life_expectancy" title="List of Asian countries by life expectancy">Asia</a></li> <li><a href="/wiki/List_of_European_countries_by_life_expectancy" title="List of European countries by life expectancy">Europe</a></li> <li><a href="/wiki/List_of_Oceanian_countries_by_life_expectancy" title="List of Oceanian countries by life expectancy">Oceania</a></li> <li><a href="/wiki/List_of_world_regions_by_life_expectancy" title="List of world regions by life expectancy">World macroregions</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">regions of countries</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_Argentine_provinces_and_territories_by_life_expectancy" title="List of Argentine provinces and territories by life expectancy">Argentina</a></li> <li><a href="/wiki/List_of_Australian_states_by_life_expectancy" title="List of Australian states by life expectancy">Australia</a></li> <li><a href="/wiki/List_of_Belgian_provinces_by_life_expectancy" title="List of Belgian provinces by life expectancy">Belgium</a></li> <li><a href="/wiki/List_of_Brazilian_states_by_life_expectancy" title="List of Brazilian states by life expectancy">Brazil</a></li> <li><a href="/wiki/List_of_Canadian_provinces_and_territories_by_life_expectancy" title="List of Canadian provinces and territories by life expectancy">Canada</a></li> <li><a href="/wiki/List_of_Chinese_administrative_divisions_by_life_expectancy" title="List of Chinese administrative divisions by life expectancy">China</a> <ul><li><a href="/wiki/List_of_cities_in_China_by_life_expectancy" title="List of cities in China by life expectancy">Cities</a></li></ul></li> <li><a href="/wiki/List_of_French_departments_by_life_expectancy" title="List of French departments by life expectancy">France</a></li> <li><a href="/wiki/List_of_Finnish_regions_by_life_expectancy" title="List of Finnish regions by life expectancy">Finland</a></li> <li><a href="/wiki/List_of_German_states_by_life_expectancy" title="List of German states by life expectancy">Germany</a></li> <li><a href="/wiki/List_of_Greek_regions_by_life_expectancy" title="List of Greek regions by life expectancy">Greece</a></li> <li><a href="/wiki/List_of_Indian_states_by_life_expectancy_at_birth" title="List of Indian states by life expectancy at birth">India</a></li> <li><a href="/wiki/List_of_regions_of_Israel_and_Palestine_by_life_expectancy" title="List of regions of Israel and Palestine by life expectancy">Israel</a></li> <li><a href="/wiki/List_of_Italian_provinces_by_life_expectancy" title="List of Italian provinces by life expectancy">Italy</a></li> <li><a href="/wiki/List_of_Japanese_prefectures_by_life_expectancy" title="List of Japanese prefectures by life expectancy">Japan</a></li> <li><a href="/wiki/List_of_regions_of_Kazakhstan_by_life_expectancy" title="List of regions of Kazakhstan by life expectancy">Kazakhstan</a></li> <li><a href="/wiki/List_of_Mexican_states_by_life_expectancy" title="List of Mexican states by life expectancy">Mexico</a></li> <li><a href="/wiki/List_of_regions_of_Israel_and_Palestine_by_life_expectancy" title="List of regions of Israel and Palestine by life expectancy">Palestine</a></li> <li><a href="/wiki/List_of_federal_subjects_of_Russia_by_life_expectancy" title="List of federal subjects of Russia by life expectancy">Russia</a></li> <li><a href="/wiki/List_of_South_African_provinces_by_life_expectancy" title="List of South African provinces by life expectancy">South Africa</a></li> <li><a href="/wiki/List_of_Spanish_provinces_by_life_expectancy" title="List of Spanish provinces by life expectancy">Spain</a></li> <li><a href="/wiki/List_of_Swedish_counties_by_life_expectancy" title="List of Swedish counties by life expectancy">Sweden</a></li> <li><a href="/wiki/List_of_Tajikistani_regions_by_life_expectancy" title="List of Tajikistani regions by life expectancy">Tajikistan</a></li> <li><a href="/wiki/List_of_Turkish_provinces_by_life_expectancy" title="List of Turkish provinces by life expectancy">Turkey</a></li> <li><a href="/wiki/List_of_British_regions_by_life_expectancy" title="List of British regions by life expectancy">UK</a></li> <li><a href="/wiki/List_of_Ukrainian_oblasts_and_territories_by_life_expectancy" title="List of Ukrainian oblasts and territories by life expectancy">Ukraine</a></li> <li><a href="/wiki/List_of_U.S._states_and_territories_by_life_expectancy" title="List of U.S. states and territories by life expectancy">USA</a> <ul><li><a href="/wiki/List_of_U.S._counties_with_shortest_life_expectancy" class="mw-redirect" title="List of U.S. counties with shortest life expectancy">shortest</a></li> <li><a href="/wiki/List_of_U.S._counties_with_longest_life_expectancy" class="mw-redirect" title="List of U.S. counties with longest life expectancy">longest</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">regions by continents</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_African_regions_by_life_expectancy" title="List of African regions by life expectancy">Africa</a></li> <li><a href="/wiki/List_of_Asian_regions_by_life_expectancy" title="List of Asian regions by life expectancy">Asia</a></li> <li><a href="/wiki/List_of_European_regions_by_life_expectancy" title="List of European regions by life expectancy">Europe</a></li> <li><a href="/wiki/List_of_Oceanian_regions_by_life_expectancy" title="List of Oceanian regions by life expectancy">Oceania</a></li> <li><a href="/wiki/List_of_South_American_regions_by_life_expectancy" title="List of South American regions by life expectancy">South America</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Records</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Longevity_claims" title="Longevity claims">Longevity claims</a></li> <li><a href="/wiki/Oldest_people" title="Oldest people">Oldest people</a> <ul><li><a href="/wiki/List_of_the_verified_oldest_people" title="List of the verified oldest people">verified</a></li> <li><a href="/wiki/List_of_the_oldest_people_by_country" title="List of the oldest people by country">by country</a></li> <li><a href="/wiki/List_of_oldest_living_people" title="List of oldest living people">living</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Immortality" title="Immortality">Immortality</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Biological_immortality" title="Biological immortality">Biological immortality</a> <ul><li><a href="/wiki/Regeneration_(biology)" title="Regeneration (biology)">Regeneration</a></li></ul></li> <li><a href="/wiki/Digital_immortality" title="Digital immortality">Digital immortality</a></li> <li><a href="/wiki/Eternal_youth" title="Eternal youth">Eternal youth</a></li> <li><a href="/wiki/Immortality_in_fiction" title="Immortality in fiction">Immortality in fiction</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Longevity genes</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/FOXO3" title="FOXO3">FOXO3</a></li> <li><a href="/wiki/Apolipoprotein_E" title="Apolipoprotein E">APOE</a></li> <li><a href="/wiki/Cholesteryl_ester_transfer_protein" title="Cholesteryl ester transfer protein">CETP</a></li> <li><a href="/wiki/Angiotensin-converting_enzyme" title="Angiotensin-converting enzyme">ACE</a></li> <li><a href="/wiki/Interleukin_6" title="Interleukin 6">IL6</a></li> <li><a href="/wiki/Klotho_(biology)" title="Klotho (biology)">Klotho</a></li> <li><a href="/wiki/Sirtuin_1" title="Sirtuin 1">SIRT1</a></li> <li><a href="/wiki/Tumor_necrosis_factor" title="Tumor necrosis factor">TNF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Blue_zone" title="Blue zone">Blue zone</a></li> <li><a href="/wiki/Longevity_insurance" title="Longevity insurance">Longevity insurance</a></li> <li><a href="/wiki/Longevity_risk" title="Longevity risk">Longevity risk</a></li> <li><a href="/wiki/Transhumanist_politics" title="Transhumanist politics">Transhumanist politics</a></li> <li><a href="/wiki/List_of_longest-living_organisms" title="List of longest-living organisms">Longest-living organisms</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235" /><style data-mw-deduplicate="TemplateStyles:r1038841319">.mw-parser-output .tooltip-dotted{border-bottom:1px dotted;cursor:help}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319" /><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319" /></div><div role="navigation" class="navbox authority-control" aria-labelledby="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q332154#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata1337" style="padding:3px"><table class="nowraplinks 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