Guys! When did you discover masturbation

Denise asked the question about the girls so I am asking for the guys.
I know I was about 5 because I can clearly remember playing with my dick and getting in to trouble with my parents. But that didn't stop me and by time I was 8 they kept telling me that it's something to do in private. (I used to play with it while watching tv and various other times). By the time I was 10 I was doing it at least once a day.

I was 7. My older cousin who was 10 was staying with us for the weekend. At night when we went to bed he asked my if I play with my willy. I didn't really understand what he was asking so he got his out and made it hard and showed me how to wank.