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.
Thesaurus: synonyms and related words
Describing age & birthdays
- a ripe old age idiom
- age group
- age limit
- aged
- be knocking (on) 60, 70, etc. idiom
- gone
- junior
- nonagenarian
- octogenarian
- old
- on the right/wrong side of 40, 50, etc. idiom
- put years on sb idiom
- senior
- spring chicken
- take years off sb idiom
- teens
- this side of sth idiom
- turn
- twenty-first
- when sb was a (mere) twinkle in their father's eye idiom
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You can also find related words, phrases, and synonyms in the topics:
Measurements of temperature
Decades, centuries & the millennium