I think in this case it has more to do with that kids (and younger people in general) can hear better and at a broader frequency spectrum. I (and I know other p

I think in this case it has more to do with that kids (and younger people in general) can hear better and at a broader frequency spectrum. I (and I know other people with the same problem) for example am always irritated why induction cooking plates make such painful noise but as most people cannot hear them, industry gets away with that. Same for those ultrasound devices to protect cars against martens that can get as loud as 200 Db.