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10 Years Old and Younger. The average fastball velocity for pitchers 10 years old and younger is between 40-50 mph. The average change up speed for this age group is about 10 mph slower, putting the velocity between 30-40 mph. 11 and 12 Year Olds. Pitchers in this age group are playing in the Majors division in Little League. The average fastball is between 50-60 mph. However, at this age the players may start to hit puberty, therefore it is not uncommon to see a pitcher throwing near 70 mph. The changeup velocity at this age is typically between 40-50 mph.
The Freshmen pitchers will usually be throwing at a comparable speed to the 13 and 14 year olds, and the Sophomores will lie somewhere in the middle. A good changeup for a high school pitcher is a -10 to -15 mph drop, so anywhere from 60-75 mph is common. high school pitcher can be anywhere from 14 to 18 years of age. This plays a factor in determining an average fastball velocity, however keep in mind that most high schools have a Freshmen, Sophomore, and Varsity program to break up the large age gap.