It could be a sign of testosterone deficiency, or it could be a rare disorder where the body never properly goes through puberty. Before he does anything else, it's very important that he goes to a trained medical professional; expecting an anonymous stranger to give sound medical advice is simply crazy, and even if one of us COULD suggest something, we would be liable for his health if he chose to try it.
Get a diagnosis first, and we can go from there. | 
