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Dictionary Meaning and Definition on 'Octogenarian'

Octogenarian Meaning and Definition from WordNet (r) 2.0
    octogenarian adj : being from 80 to 89 years old n : someone whose age is in the eighties
Octogenarian Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Octogenarian \Oc`to*ge*na"ri*an\, n. A person eighty years, or more, of age.
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Wikipedia Meaning and Definition on 'Octogenarian'

Ageing (British and Australian English) or aging (American and Canadian English) is the accumulation of changes in an organism or object over time.

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, such as the onset of type two diabetes). Chronological ageing, referring to how old a person is, is arguably the most straightforward definition of ageing and may be distinguished from "social ageing" (society's 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 poliomyelitis).

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