Etymology
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thirties (n.)

1827 as the years of someone's life between 30 and 39; 1830 as the fourth decade of years in a given century. See thirty.

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Definitions of thirties

thirties (n.)
the time of life between 30 and 40;
Synonyms: mid-thirties / thirty-something
thirties (n.)
the decade from 1930 to 1939;
Synonyms: "s
From wordnet.princeton.edu