Anyway, I still beleive it is to do with how fast your brain develops. You may have the academic age of a 21 year old at 15, but when you are 30, you will prob be academically 30 years old. While someone who is academically 15 at 15 will also be 30 at 30 (all other things being equal). I think things will even out. (eg is a professor of physiscs who did normal school better or worse than one who did it 10 years faster? I highly doubt it (intersting to see how many gifted children won noble prizes to test this idea).
Anyway, I feel better now. They are not better than me. Good, much better