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[[File:lighterstill.jpg]][[File:Ageing.jpg|right|frame]]
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*[http://en.wikipedia.org/wiki/14th_century 14th Century]
*[https://en.wikipedia.org/wiki/14th_century 14th Century]
==Definitions==
==Definitions==
*1: to become old : show the [[effects]] or the characteristics of increasing age
*1: to become old : show the [[effects]] or the characteristics of increasing age
'''Ageing''' (British English) or '''aging''' (American English) is the accumulation of [[changes]] in an [[organism]] or object over time. Ageing in [[humans]] refers to a multidimensional [[process]] of [[physical]], [[psychological]], and [[social]] [[change]]. Some [[dimensions]] of ageing grow and expand over time, while others decline. [[Reaction]] time, for example, may slow with age, while [[knowledge]] of world [[events]] and [[wisdom]] may expand. [[Research]] shows that even late in life, [[potential]] exists for [[physical]], [[mental]], and [[social]] growth and [[development]]. Ageing is an important part of all [[human]] [[societies]] reflecting the [[biological]] changes that occur, but also reflecting [[cultural]] and societal [[conventions]].
'''Ageing''' (British English) or '''aging''' (American English) is the accumulation of [[changes]] in an [[organism]] or object over time. Ageing in [[humans]] refers to a multidimensional [[process]] of [[physical]], [[psychological]], and [[social]] [[change]]. Some [[dimensions]] of ageing grow and expand over time, while others decline. [[Reaction]] time, for example, may slow with age, while [[knowledge]] of world [[events]] and [[wisdom]] may expand. [[Research]] shows that even late in life, [[potential]] exists for [[physical]], [[mental]], and [[social]] growth and [[development]]. Ageing is an important part of all [[human]] [[societies]] reflecting the [[biological]] changes that occur, but also reflecting [[cultural]] and societal [[conventions]].
Age is measured [[chronologically]], and a [[person]]'s [[birth]]day is often an important [[event]]. However the term "ageing" is somewhat [[ambiguous]]. Distinctions may be made between "[[universal]] ageing" (age changes that all people [[share]]) and "probabilistic ageing" (age changes that may happen to some, but not all people as they grow older including [[diseases]] such as [http://en.wikipedia.org/wiki/Diabetes_mellitus_type_2 type two diabetes]). Chronological ageing may also 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). There is also a distinction 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 back to a [[cause]] early in person's life, such as childhood [http://en.wikipedia.org/wiki/Poliomyelitis poliomyelitis]).
Age is measured [[chronologically]], and a [[person]]'s [[birth]]day is often an important [[event]]. However the term "ageing" is somewhat [[ambiguous]]. Distinctions may be made between "[[universal]] ageing" (age changes that all people [[share]]) and "probabilistic ageing" (age changes that may happen to some, but not all people as they grow older including [[diseases]] such as [https://en.wikipedia.org/wiki/Diabetes_mellitus_type_2 type two diabetes]). Chronological ageing may also 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). There is also a distinction 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 back to a [[cause]] early in person's life, such as childhood [https://en.wikipedia.org/wiki/Poliomyelitis poliomyelitis]).
[[Differences]] are sometimes made between [[populations]] of elderly people. Divisions are sometimes made between the young old (65–74), the middle old (75–84) and the oldest old (85+). However, problematic in this is that [[chronological]] age does not correlate perfectly with [[functional]] age, i.e. two people may be of the same age, but differ in their [[mental]] and [[physical]] capacities. Each [[nation]], [[government]] and non-government organization has different ways of [[classifying]] age.
[[Differences]] are sometimes made between [[populations]] of elderly people. Divisions are sometimes made between the young old (65–74), the middle old (75–84) and the oldest old (85+). However, problematic in this is that [[chronological]] age does not correlate perfectly with [[functional]] age, i.e. two people may be of the same age, but differ in their [[mental]] and [[physical]] capacities. Each [[nation]], [[government]] and non-government organization has different ways of [[classifying]] age.
[[Population]] ageing is the increase in the number and [[proportion]] of older people in [[society]]. Population ageing has three possible causes: migration, longer [http://en.wikipedia.org/wiki/Life_expectancy life expectancy] (decreased [[death]] rate), and decreased [[birth]] rate. Ageing has a significant impact on [[society]]. Young people tend to commit most [[crimes]], 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]] as opposed to young people, and frequently differing [[values]] as well. Older people are also far more likely to [[vote]], and in many countries the young are forbidden from voting. Thus, the aged have comparatively more [[political]] [[influence]].
[[Population]] ageing is the increase in the number and [[proportion]] of older people in [[society]]. Population ageing has three possible causes: migration, longer [https://en.wikipedia.org/wiki/Life_expectancy life expectancy] (decreased [[death]] rate), and decreased [[birth]] rate. Ageing has a significant impact on [[society]]. Young people tend to commit most [[crimes]], 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]] as opposed to young people, and frequently differing [[values]] as well. Older people are also far more likely to [[vote]], and in many countries the young are forbidden from voting. Thus, the aged have comparatively more [[political]] [[influence]].
==See also==
==See also==
*'''''[[Life Extension]]'''''
*'''''[[Life Extension]]'''''
[[Category: Sociology]]
[[Category: Sociology]]