Heh funny you should say that. I started playing music in the age range of the poll... I'm more than double that age now and spent years playing in groups and after a brief bit of time off am actively getting back into it. (in fact getting to see one of my lifelong folk heroes just tonight by chance)

At the same age I also became fascinated by computers... and I'm working as a computer programmer.

That said—I might just be further data in support of your exposure theory.