Definition of thirtysomething
: having an age of 30 to 39 years old thirtysomething parents; also : of or relating to people in their thirties Just the usual thirtysomething decor—Persian rug, book-shelves, abstract paintings, glass coffee table, … and a few exotic trinkets picked up on foreign junkets. — Marly Swick
First Known Use of thirtysomething
Seen and Heard
What made you want to look up thirtysomething? Please tell us where you read or heard it (including the quote, if possible).