I got it..You dont have to be at an age but at the begining of the registration they say "I am 13 of age and understand the rules" or " I am 12 and agree to the rules"
Peter (when he's hungover): This sucks worse than that time I went to that museum. (Flashback to childhood, standing in front of dinosaur skeletons.)
Peter (as a child): Why did all the dinosaurs die?
Man at Museum: Because you touch yourself at night.