my son is 9 yrs old and is averaging 40 MPH from 46' w/o pitching from a mound or rubber. I was wondering the same thing. Ultimately the strikes are going to make the difference.
9yr old avg 44-49 mph
9yr old above avg 50-55 mph
9yr old excellent 55-61 mph
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I would agree. When they are about 9 1/2 they should hit 45mph with decent command. If they train, there is no reason they cannot hit 47-48, but most don't. My son is 9, and I fully expect to see 50 at some point later this season. There is a lot of time yet.
The "average" pitch speed for a 9 year old would be around 33-38 mph. The "average" pitch speed for a 10 year old would be around 39-45 mph.