there is none. Only people that either cant play FPS games because their parents wont let them play sims. Personally I hate them. I cant play them for more than 5 mins.
To be honest, that game is directed towards an older crowd, ages 25 and up. Even though anyone can play it, the addiction level is greater for people with more age, due to the real-time stragety (keeping people alive, managing money, etc). This is how it is for most of the sim games, IMO.