Meaning of “thirties” in the English Dictionary

british dictionary

"thirties" in British English

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thirtiesnoun [ plural ]

uk /ˈθɜː.tiz/ us /ˈθɝː.t̬iz/

B2 A person's thirties are the period in which they are aged between 30 and 39:

My brother is in his thirties.
the thirties

the range of temperature between 30° and 39°:

The temperature is expected to be in the thirties tomorrow.

B2 the decade (= period of ten years) between 30 and 39 in any century, usually 1930–1939:

My grandparents fled Germany in the thirties.

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

"thirties" in American English

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thirtiesplural noun

also 30s, 30’s us /ˈθɜr·t̬iz/

the numbers 30 through 39:

My sisters are in their thirties (= between 30 and 39 years old).
The temperature is expected to be in the thirties (= between 30° and 39°) tomorrow.
These dresses were fashionable in the thirties (= between 1930 and 1939).

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