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How old should a pitcher be before he starts throwing the curve? Most of the blogs and forums out there seem to think a good age to start throwing a curveball is 15 â 16 years old. However, there are also some out there that believe it is ok for a 12 year old to start learning and throwing the curveball.
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.0 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.