The causes of aging are uncertain; current theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the programmed aging concept, whereby internal processes (such as DNA methylation) may cause aging.

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The idea of "older people" as a stand-alone population, complete with its own distinct set of stereotypes in terms of behavior, appearance and mind-set, seems like something that has been around forever. But in reality, our current narrative of aging — the story we tell ourselves about the normal progression of life, including its second half — is a relatively recent invention

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The causes of aging are uncertain; current theories are assigned to the damage concept, whereby the accumulation of damage (such as DNA oxidation) may cause biological systems to fail, or to the programmed aging concept, whereby internal processes (such as DNA methylation) may cause aging.

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