Geez, is everyone getting their wisdom teeth pulled? I hope I wont have to get mine pulled, judging from different people explaining the pain afterward and what you can/can't eat.
It depends on each person and your teeth, really.
There's usually two moments where you have to pull your wisdom teeth; if there's no space in your mouth or if they could damage any close nerves.
Of course, if you're lucky, they never grow at all, but if they do, it's usually between 15 to 20.