Pen*s size

is six inches a good size for a 15 year old

Yes, a guy's pen*s will continue to grow throughout his teenage years, and even into the early twenties. 6 inches is an average size (of adult males), so you will quite possibly end up above average. Don't get too concerned about your pen*s size, because it really isn't all about how big it is. You could have the biggest pen*s ever, but if you don't know how to use it then it is no better than the smallest pen*s in the world. It's all in how you use it.