/ Thesaurus / M Synonyms of mid fifties Find synonyms for: Noun1. fifties, mid-fifties, time of lifeusage: the time of life between 50 and 60WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language