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I couldn't say about youth true sticks and their flex over time, but I have to point out that your sons size seems bigger than most kids who would use a 15 flex stick. Generally someone 75 pounds would use around a 30 flex, could use a 25 could use a 35 depending on how they load and shoot but I would think 15 might end up twisting and flaring more than they would like it to. My son is really small, he's maybe 51" tall, 80 pounds and uses a full length 30 flex, I think he could bump up to 40 but I have some 35 flex on order for him to bridge the gap. If it wouldn't hurt the pocket book to give the 15 flex a shot by all means I could be totally wrong and he could love it but based on my experience the 10 and 15 flex sticks are for the 30-50 pound mini mites.