12 letters · 15 points in Scrabble
noun someone whose age is in the eighties
adjective being from 80 to 89 years old
originFrom Latin octōgēnārius + -an (suffix forming adjectives and representative nouns), either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”).
Etymology from Wiktionary, CC BY-SA 3.0