The great thing about music production is that age really doesn't matter at all. As long as you are able to create something quality and fresh, you will be successful. Plus producing music can be a career as well as a hobby. I love producing music and I plan to continue it for as long as I am able to whether I make money or not. If you are trying to turn producing music into a career, I suggest you start working hard on learning and developing a sound because you'll probably be broke a long while before you start making decent money. That's one reason why its best to start out young before you have bills and responsibilities to take care of.