Considering how limited the 'teen' age is in the game, I'd say it is closer to 12 than 19, or 18, the legal age in my country, for instance when you are allowed to take courses at university. Teens cannot do that in TS4. Legal age for consentual sex, within the same age span, is 15, also where I live; and the teens cannot 'woohoo' in the game. I am certain this is based on american/us culture; not mine, and so more related to pleasing a conservative lobby than about portrayal of an actual age. I think the reason for the flexibility in relationship settings in CAS is in some part also influenced by the protested inflexibility for that in TS3. The iterations exists in a game continuum as well as being mildly related to life, and heavily dependent on politics.
