octogenarian

Being between 80 and 90 years of age.

A person between 80 and 90 years of age.

Eighty years of age; also, between eighty and ninety years of age.

A person eighty or eighty-odd years of age.

A person eighty years, or more, of age.

One who is between the age of eighty and eighty-nine, inclusive.

Being between the age of 80 and 89, inclusive.

Of or relating to an octogenarian.

someone whose age is in the eighties

being from 80 to 89 years old