Also means
one's thirties
Usage Note
trentaine is a collective numeral noun, like dizaine (about ten) or vingtaine (about twenty). Une trentaine de personnes means about thirty people. Avoir la trentaine means to be in one's thirties. It carries a softer, approximate sense compared to the exact number trente.
Examples
"Une trentaine de personnes attendaient dehors."
Natural Translation
About thirty people were waiting outside.

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