Question: how fast does an average 13 year old pitch?
Answer: 13 and 14 Year Olds A typical fastball from this age group is anywhere from 55 mph (on the low side) to 75 mph. A pitcher throwing 75 mph is well above average for this age, and their fastball is at a high school caliber. An average changeup for this age is somewhere around the 50-60 mph mark.