What if I lower the standard to a 150 OPS+? Here are all the players to have 2 seasons of at least a 150 OPS+ through the age of 21.
Mel OttRogers Hornsby
It seems like Trout has a great chance to join that group. Here are all the players who had 1 or more seasons of at least a 150 OPS+ through the age of 21
Al KalineAlbert Pujols
Again, a very outstanding group of players.