Is The Sims too childish now? Teen & Adult players have been forgotten

I'm 40, my daughter is 13, neither of us feels it's too childish a game. It's a matter of personal taste, I guess. The game is 12+/Teen, which means it needs to stay relatively clean to fit the rating. But I will never understand why clean should equal childish.
The emotion system could do with an overhaul and have more consequences but that's a whole different conversation.

Kids will always convince their parents to buy the game no matter the rating anyway.

This is a bad argument for anything.