not easy to give a hard-and-fast answer. there are many variables affecting experience: playing time and level of competition are fundamental, but i understand experience can also be affected /improved if a player is a NT player or has played in the B3 tournament. i understand hitting a Buzzerbeater (the last second shot) adds to experience, as does post-season play.
from my team:
-- 38 years old: experience at 14
-- 31 years old: starter, experience at 9
-- 31 years old: bench player, experience at 5