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I don't know exactly what methodology you used. If you're comparing all the age 21 players to all the age 26 players, you have an issue where only the best prospects are going to debut by age 21, and those will tend to be better hitters.
Are you comparing each player's age 21 season to the same player's age 26 season, or are you comparing all the age 21 players to all the age 26 players?
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