The fastest pitch ever thrown clocked officially was 78 MPH.
The fastest pitch ever thrown by a 12 year old that was recorded was Zach Ours, who threw 78 MPH.
Sadly no one has ever kept record for this
My brother is six and he throws 35-37mph
125 mph by Ug U thannik, a Cro Magnon child aiming at his supper!!
The fastest ever recored softball pitch is 95. By a 18 year old in Texas!!
Nick O'Dell-86 mph
The fastest officially clocked pitch was by Brian Jarrell at 72 MPH.
In September 2010, 22 year old Aroldis Chapman of the Cincinnati Reds threw the fastest pitch on record against the San Diego Padres, the pitch was clocked at 105 mph.
The fastest softball pitch ever recored was from a 18 year old girl from Texas at the speed of 95!!
This isn't an officially-kept statistic anywhere - you're onmly going to get heresay and conjecture asking that here.