The target age of our youth oriented culture gets lower all the time. Thirty was the cutoff point in the Sixties. In the Nineties it was still about twenty-somethings (Seinfeld, Friends), and getting younger all the time and now in the past decade it's gone down to teens - Harry Potter, Twilight, Hunger Games. Do you think it will eventually come to rest at some barely pubescent age? That's Nostrathomas' prediction. Oversimplified, sure, but not entirely wrong.