Synonyms and related words :
adult, archetypical, blase, classic, consummate, cosmopolitan, cosmopolite, developed, exemplary, experienced, expert, finished, full-blown, fully developed, knowing, masterful, masterly, mature, matured, mellow, model, not born yesterday, old, perfected, polished, practiced, proficient, quintessential, refined, ripe, sagacious, seasoned, sophisticated, tried, tried and true, veteran, world-wise, worldly, worldly-wise