My son is 14, 5’7"-5’8" 120 lbs.
He throws 68 mph off a mound, 72 mph with a running start.
From what I understand, that’s considered above average but not elite for his age.
I coached him in a Game Day USA all star game last year and based on data we were given there, the average 14 year old participant threw 68 mph with a running start, 64 mph for 13 year olds.
But, that’s for all star caliber players…and with a running start.
He also does velocity training with ELITE level kids and for his age group he’s usually at the low end. Most ELITE kids his age around throwing mid 70s to 80…mid 70s off the mound.
And then off course there’s that ONE kid…86 mph off the mound.
14 years old.