octogenarian adj : being from 80 to 89 years old n : someone whose age is in the eighties

Octogenarian \Oc`to*ge*na"ri*an\, n. A person eighty years, or more, of age.

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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).

• Octogenarian mountaineers in battle to conquer Everest
  Two octogenarian mountaineers are launching separate bids to conquer Everest and break the world record for the oldest successful ascent.         Read more on this news related to 'Octogenarian'
• Forest of Galtres golfers take part in octogenarian competition
  EIGHT members of the Forest of Galtres EGGS (Elderly Gentlemen’s Golf Society) who are in their 80th year and beyond, took part in an octogenarian competition and celebration lunch” at the clubhouse. Read more on this news related to 'Octogenarian'
• Octogenarian sentenced for abusing girl
  REXBURG (AP) - An 82-year-old eastern Idaho man convicted of sexually abusing a 4-year-old girl was sentenced to 20 years in prison. Read more on this news related to 'Octogenarian'