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octogenarian

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
  1. adjective
    being from 80 to 89 years old
    Synonyms:
    old
    (used especially of persons) having lived for a relatively long time or attained a specific age
  2. noun
    someone whose age is in the eighties
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