My experience was similar to MutantJohn's - I was very sporty until I needed to get specs around 13/14 - Rugby,Football,Gymnastics etc - but the one thing you are aware of when you get specs is how vulnerable they are if you engage in the rough n tumble of such things and also the annoyance of broken glasses and being reduced to seeing the world as a big blur.
So I would theorise that the younger you get glasses the more careful you end up being and just naturally start avoiding situations where your glasses are going to be vulnerable to damage - so you are more likely to pursue more nerdy activities etc.