I have seen it time and time again. A little girl or boy running incredible times at 9,10,11 or whatever. I am talking times that are good regional times for pro women in some cases, but you will probably never hear about them after that. There was a family of kids in the 80s who ran very impressive times, but never did anything as adults, basically they just gave it up. I can't think of any fast kids doing anything as a pro. I don't recall any 14 year old running super impressive times, and end up making the Olympics. I know they might be one or two out there, but most never do anything, infact most never get any faster.