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Old people have [[limited]] regenerative [[abilities]] and are more prone to [[disease]], syndromes, and sickness than younger adults. For the [[biology]] of ageing, see [http://en.wikipedia.org/wiki/Senescence senescence]. The medical [[study]] of the aging [[process]] is [http://en.wikipedia.org/wiki/Gerontology gerontology], and the study of diseases that afflict the elderly is [http://en.wikipedia.org/wiki/Geriatrics geriatrics].
Old people have [[limited]] regenerative [[abilities]] and are more prone to [[disease]], syndromes, and sickness than younger adults. For the [[biology]] of ageing, see [http://en.wikipedia.org/wiki/Senescence senescence]. The medical [[study]] of the aging [[process]] is [http://en.wikipedia.org/wiki/Gerontology gerontology], and the study of diseases that afflict the elderly is [http://en.wikipedia.org/wiki/Geriatrics geriatrics].
<center>For lessons on the related [[topic]] of '''''Ageing''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Ageing '''''this link'''''].</center>
<center>For lessons on the related [[topic]] of '''''Ageing''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Ageing '''''this link'''''].</center>
The boundary between [http://en.wikipedia.org/wiki/Middle_age middle age] and old age cannot be [[defined]] exactly because it does not have the same [[meaning]] in all [[societies]]. People can be [[considered]] old because of certain [[changes]] in their activities or [[social]] roles. Examples: people may be considered old when they become [http://en.wikipedia.org/wiki/Grandparent grandparents], or when they begin to do less or different work—[[retirement]].
The boundary between [http://en.wikipedia.org/wiki/Middle_age middle age] and old age cannot be [[defined]] exactly because it does not have the same [[meaning]] in all [[societies]]. People can be [[considered]] old because of certain [[changes]] in their activities or [[social]] roles. Examples: people may be considered old when they become [http://en.wikipedia.org/wiki/Grandparent grandparents], or when they begin to do less or different work—[[retirement]].