If he answers or not makes no difference. Maybe it's his first time on AB, and he doesn't know how to answer. Why make assumptions all the time? Does it really matter to YOU? Is it going to change your evening? No. So get over it, and answer sensibly if you want to. No need to pass the time by typing some wise cracks and risk upsetting this person, or any other that may see this question and have genuine concerns.
I agree that 14 is young, but he's a young boy, and we've all experimented, no need to hide behind a veil of faked prudishness or act all shocked to please the crowds.