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