资料来源 : pyDict

八十岁的,八十多岁的八十岁,八十多岁

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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

资料来源 : WordNet®

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