did they make it where teens can't die ?

Why do you want to kill your Sims ! If you want to kill stuff , play Wolfenstein and shoot/blow up zombie Nazis. Or get your violent impulses out in a guilt free way by playing a Middle Earth themed hack n' slash game and chop limbs off a few Orcs !

I one of my Sims had a son or daughter I really couldn't stand, I'd just age them up with a birthday cake and have them move out, to a different neighborhood, wait for relationship culling to do its job..