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When my oldest pitched (doesn't anymore), there were several really tall 10, 11 and 12 year olds that could absolutely bring it. I always thought that at 10u (with the smaller ball) there were at least 3 kids that threw in the low fifties (they were all 5'3-5'6). I recall there being a couple 12u's that threw mid fifties (but again, these girls were 5'8-5'9 at age 12). Then we hear about the freak 13u kid that is 6' and thowing 60.....well yeah, if you are that tall sure you might be able to throw that fast.
Most 10's are probably 43-45, most 12s are 46-48.
Most 10's are probably 43-45, most 12s are 46-48.