Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
five-year-old is an adjective meaning "five years of age". It carries one recorded sense.
five years of age
Definitions, synonyms and semantic relations for five-year-old come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.