Hearing loss

Well well well, this post is going to be about the sound that you can hear while you're getting older, at the beginning of your life you can hear ultrasound waves , and it sounds like beep.. and it's frequency is more less 22000 Hz , we'll I tested it and i can hear very good 19500 Hz somebody can't hear it , also it depends of your ears, if they're good you should hear high freq. When you're adult you only hear 15000 Hz and we can test it at this site > here