No chores, no kids, no girlfriend/wife. That's where time goes. I was crazy productive when I was 15 (and when I was 12). Now I'm 33 with a wife and kids I just don't have the time. But then again I work on problems that are two-three factors harder than this during the day, so it all evens out.

Keep up the good work kid, try lots of stuff out now, find something you like, then go deep. It only gets more fun :)