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English definition of “fifties”

fifties

noun [plural] uk   /ˈfɪf.tiz/ us  
B2 A person's fifties are the period in which they are aged between 50 and 59: My dad's in his fifties. the fifties the range of temperature between 50° and 59°: It's been in the fifties all week. B2 the decade (= period of ten years) between 50 and 59 in any century, usually 1950–1959: Rock and roll first became popular in the fifties.
(Definition of fifties from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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