Yeah same here (Europe), never heard about anyone having (pea)nut allergy, but now my own kids have it (for the record wife also doesn't have it), and not just peanuts, other nuts as well (cashew, pistachio, walnuts). But from what I've seen in Prague kindergarten lists of allergic kids, it's still quite rare, like 1-2 kids max out of 20-24 kids class. Seems gluten allergy is more common than (pea)nuts.