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Son was quite a bit younger. If you think about it, half of the kids trying to be recruited are younger than the average . Once you are shooting for college ball, you must be a very good player, regardless of whether younger or older than others in your class. He would be best advised to completely ignore that issue. The college recruiters don't care and neither should he. He is either a player or he isn't. He will either continue to work as hard as he can toward maximizing his abilities or he won't.
You found a great resource... best to him!