Fifties

/ˈfɪftiz/ noun

the decade from 1950 to 1959, or the years when someone is between 50 and 59 years old, or the numerical range of 50 to 59.

From 'fifty' (from 'five' + 'ten', Old English origins) + '-ies' (plural). This is a straightforward compound referring to groups of fifty.

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