I was 13 when u started masturbating and now i am 19.Masturbation is tooooo dangerous.... it spoils your whole life in my all teen age i have done masturbation. My eyesight is weak. Cant study. Cant walk too much. So my friends leave this habbit you will get a good life. And the most important side effect of masturbation is that when you get married you cant satisfy your women. It also causes premature ejaculation