I was born in 1976 and I remember one girl who was in my class who was incredibly allergic to peanuts, but I don't remember it being such a huge deal that none of us could eat peanut butter. My niece is in pre-school and because there's one kid with a peanut allergy no one is allowed to eat peanut butter or anything that's touched a peanut. It seems extreme, although knowing how preschoolers are, it kinda makes sense because they get into everything at that age.