I was like 11/12 y/o when I encountered this site : http://ecole-art-aix.fr/rubrique81....
It's a French design university's Processing course. I don't remember how I got there, but I guess Internet had a pretty good influence on me then. However, as I had not learned about variables in math classes yet it was a pretty tough bite for me, so I didn't finish it but it was a good start for me