You adventure till

A)You die
B)You achieve all your goals
C)You wake up in cold sweat, having fireballed the roof of the inn off in a nightmare-fueled reaction.
D)You find more happiness is coming from non-adventuring life (wife, estate, etc.)
E)You never stop adventuring----ever. You find one of the many ways to become immortal & swagger off into the sunset to uncharted lands
F)You find one of the epic retirement homes, service to a god, archmage in a tower, swordsmaster for a combat academy etc.