Is it normal that my bro masterbates at 11?

Ok so my bro always hung out with the wrong crowd, and I got used to his occasional perverted jokes, but lately I realized he isn't t acting to what I percueve as normal. One fateful day, I went to go to his room to grab something, then I realized that he gad porn on his touch! This kid hasn't gone through puberty yet, so after collecting my self, I decided not to speak of it. Usually when he and I had small talk, to taunt him, I would give the occasional clue that I saw porn on his itouch. And he would as I thought dismiss it as a joke. Then, months later, he tells me he was masterbating that day... This kid hasn't even grown hairs, so wth is he doing playing with himself. I suspect that he got this from his friends. I hope this story doesn't become famous, because I havn't told my parents. Should I support him, or should I tell him he's a freak? If you guys have sn interesting story please don't hesatate to comment. Piece.