Etymology
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sixties (n.)

1848 as the years of someone's life between 60 and 69; 1827 as the seventh decade of years in a given century. See sixty.

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Definitions of sixties

sixties (n.)
the decade from 1960 to 1969;
Synonyms: "s
sixties (n.)
the time of life between 60 and 70;
Synonyms: mid-sixties
From wordnet.princeton.edu