Synonyms for Of age:

adj.

adult (adjective)
developed, virile, nubile, serious, reasonable, mature, full-grown, adult.
all (adjective)
aged.
full-grown/full-fledged (adjective)
adult, nubile, mature.
mature (adjective)
full-grown.

n.

of age (noun)
old, aged.

Other synonyms:

Other relevant words:
adult, old, aged.