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noun, feminine

trentaine

/tʁɑ̃.tɛn/

noun, feminine/tʁɑ̃.tɛn/plural: trentaines

trentaine is feminine in French.

about thirty; one's thirties (period of life between ages 30 and 39)

“un homme dans la trentaine” — a man in his thirties

From trente + -aine.