1) Being from 80 to 89 years old 2) French word used in English 1) Eightyyearold 2) Old 3) Oldster 4) Veteran 
• (n.) A person eighty years, or more, of age.
Oc`to·ge·na'ri·an noun A person eighty years, or more, of age. 
Octogenarian: Someone in his or her eighties, that is, between 80 and 89 years of age. See also: Age by decade.
[adj] - being from 80 to 89 years old 2. [n] - someone whose age is in the eighties
octogenarian 1. A person who is in her/his eighties. 2. A person who is eighty to eighty-nines years old.
adjective being from 80 to 89 years old