How would you improve Teens?

Personally, I'd like to see a few more teen-specific interactions and game-play elements. But I also really think that making them a bit shorter than adults would be good for the game. (Yes, I know, some teens are just as tall or taller than some adults -- my nephew towered over me by the time he was in high school. But that's totally not the point. The issue is creating a sense of progression in-game, which the height difference does nicely.) YMMV, of course.