Meaning of “sixties” in the English Dictionary

british dictionary

"sixties" in British English

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sixtiesnoun [ plural ]

uk /ˈsɪk.stiz/ us /ˈsɪk.stiz/

A person's sixties are the period in which they are aged between 60 and 69:

Many people retire in their sixties.
the sixties

the range of temperature between 60° and 69° Fahrenheit:

The temperature is usually in the sixties at this time of year.

B2 the decade (= period of ten years) between 60 and 69 in any century, usually 1960–1969:

The Beatles made their first hit records in the sixties.

(Definition of “sixties” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"sixties" in American English

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sixtiesplural noun

also 60s, 60’s us /ˈsɪks·tiz/

the numbers 60 through 69:

The temperature is expected to be in the sixties (= between 60° and 69°).
This building was a concert hall in the sixties (= between 1960 and 1969).
Uncle Buddy is in his sixties (= between 60 and 69 years old).

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