Meaning of “fifties” in the English Dictionary

british dictionary

"fifties" in British English

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fiftiesnoun [ plural ]

uk /ˈfɪf.tiz/ us /ˈfɪf.tiz/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"fifties" in American English

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fiftiesplural noun

also 50s, 50’s us /ˈfɪf·tiz/

the numbers 50 through 59:

The temperature has been in the fifties (= between 50° and 59°).
My dad is in his fifties (= between 50 and 59 years old).

The fifties are the years between 1950 and 1959.

(Definition of “fifties” from the Cambridge Academic Content Dictionary © Cambridge University Press)