My oldest son was clocked at 72 max after freshman year; hit 80 summer after sophomore year. Junior year grew some to about 5’10”, then sat about 82-85. Was lucky to get invite to Stanford camp (I first threw invite out but after reading on perfect game’s website go to this camp if invited and your player is high academic), hit 87-88 and was recruited and landed D1. He played at 6’1” 185 early in college but grew to about 6’2” 200, 88-91, max 93.
Velocity numbers standing alone for a young player can be a poor indicator of future numbers. If you are young developmentally do not be discouraged by some who throw harder now. Work on your mechanics, work on becoming physically stronger, eat well and get plenty of sleep, work hard in school, stay out of trouble, take care of and listen to your parents. Good luck.