How old were you when you first started to masturbate?

Pretty sure I was around 10. Fifth grade, I remember staying home sick pretty often (I hated going and my mom wasn't going to argue with me about it) and it was just a thing to do during the day! I found a Cosmo or something and there was an article that stated that it takes a woman an average of four minutes to have an orgasm, and I would like, race against myself.