12 letters · 20 points in Scrabble
noun someone whose age is in the sixties
adjective being from 60 to 69 years old
originFrom Latin sexāgēnārius (“containing 60”) + -an (forming adjectives and representative nouns), either directly or via French sexagénaire, from Latin sexāgēnus (“60 each”) + -ārius (“-ary”), from sexāgintā (“six tens, 60”).
Etymology from Wiktionary, CC BY-SA 3.0