Someone who's octogenarian is older than 80 and younger than 90. If your great-aunt is 84, she's an octogenarian.

You can use this word as an adjective or a noun for anyone who is in their eighties. Many octogenarians are grandparents. While one octogenarian might live in an assisted living residence and use a wheelchair, plenty of octogenarian folks drive their own cars and live in houses or apartments. Just like teenagers or thirty-somethings, octogenarians don't necessarily have much in common with each other aside from their age.

Definitions of octogenarian

adj being from 80 to 89 years old

(used especially of persons) having lived for a relatively long time or attained a specific age

n someone whose age is in the eighties

Type of:
golden ager, old person, oldster, senior citizen
an elderly person

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.