21 is the last season for a player in the youth bracket for training on this game, before they turn 22 and stay in the next bracket until they reach 25, then the next bracket is 26-28, then its 29-31, then its 32+. Nordeus should extend the 26-28 bracket to 26-29 and the 29-31 bracket should be moved to 30-33, then 34+ should be retirement bracket with players possibly playing upto 39.