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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
thirty-something is a noun meaning "the time of life between 30 and 40". It carries one recorded sense.
the time of life between 30 and 40
Definitions, synonyms and semantic relations for thirty-something come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.