You make a good point there. For one, that's why some are geniuses and others are not.

I watch a 4 year old solve maths faster than an adult in one of the American's talent shows.

By time the boy is 20, you bet he will be exceptionally successful compared to his age grades.

Also believe working hard doesn't equate to success, rather working smart does. Which is what I see in your case not your DNA per se.