You would want to fill HS feeder leagues with players ages 15-18 (so that way you get an even mix of guys) and then after you do that set the player created min and max each to 15 (so that new players will be freshman and continue a steady stream of guys each year) and the player age max to 18. Then do the same for your college leagues, except the ages would be 18-21 or 19-22.
This is from memory, haven't really done a league with feeders since OOTP 13.
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