[blazey]

I think its stupid to say you can put an age range on hearing certain tones. I remember when I was younger there was this constant beep i could hear, very faintly and really high pitched. I used to think it was natural to hear the noise and one day there was a news paper report saying the beep had finally been stopped and those who could hear it would finally be able to sleep. I thought it had been absolutely normal to hear high pitched beeping lol.

Also, it reminds me of the dog collars you can get that beep so high pitched that only the dog can hear and its meant to shut them up.