[NSFW] Guys, at what age and in what manner did you discover masturbation?

NSFW _Disclaimer: Per backdoor request to be fair in question asking, a question for males, not those females are sure to have something to say, even when they do not know.

Guys, at what age did you discover masturbation? Did you discover it on your own, was lead that way by older brothers, came across it in a book, (seen it on the Net, something we did not have back in the day)? Did you learn to jack off from a girlfriend, some girl known, female relative like a cousin. When you 1st did it, did it live up to what you heard or it took many attempts before it had the desired effect?