Definition of “forties” - English Dictionary

british dictionary

“forties” in British English

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fortiesnoun [ plural ]

uk /ˈfɔː.tiz/ us /ˈfɔːr.t̬iz/

B2 A person's forties are the period in which they are aged between 40 and 49:

She's probably in her early forties.
the forties

the range of temperature between 40° and 49°:

The temperature is expected to be in the forties tomorrow.

B2 the decade (= period of ten years) between 40 and 49 in any century, usually 1940–1949:

Our house was built some time in the forties.

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

“forties” in American English

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fortiesplural noun

also 40s, 40’s us /ˈfɔr·t̬iz/

the numbers 40 through 49:

The temperature will be in the forties (= between 40° and 49°) today.
Our house was built in the forties (= between 1940 and 1949).
They are both in their forties (= between 40 and 49 years old).

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