I would be happy to keep teens as they are but with more teen appropriate game play because at the moment they feel a bit bland (like the elders) however I would not be against purchasing tweens in some sort of a pack as an additional life stage. That way people who want younger teens could get them separately not affecting those players who do not want them. I think a game pack would suffice for this though, I wouldn't want to waste an expansion seeing how rarely they come.(also if we have a university expansion at any point in the future they could do a better overhaul of teens then by expanding upon education and stuff like that-although I assume a university would target young adults more than teens)