Go to an archery shop, not a box store type of deal but an actual archery shop, and shoot everything he can get his hands on. I'm no expert by any means. I had my heart set on a Prime a few years ago, I just loved how they looked. I walked into a shop in Boise and asked to shoot everything RH, 70lbs, 34inches axle to axle or bigger. I shot I believe 6 different bows, Prime, PSE, Hoyt, Mathews, and ended up with a PSE Evo. Just being able to shoot them and feel each draw cycle back to back and how the bow feels was such a help. And those guys are gonna know the adjustability of each bow and what he can grow with a bit. Just my .02 cents.