An octogenarian is someone in their 80s (80 to 89 years old), or someone who is 80 years old. Octogenarian can also be used as an adjective to describe someone in their 80s, as in Our audience is mostly made up of octogenarian women, or things related to such a person, as in I have entered my octogenarian years.

What does the term octogenarian mean?

: a person who is between 80 and 89 years old. See the full definition for octogenarian in the English Language Learners Dictionary. octogenarian. noun.

Where did the word octogenarian come from?

The word octogenarian comes from the Latin word octōgēnāri(us), meaning “containing eighty” or “eighty years old,” from octōgēn(ī), meaning “eighty each.”