Can You Hear It? Sonic Devices Play High-Pitched Noises To Repel Teens

It is true back when I was teaching I took an 8th grade class to UK department of biology for a field trip and they did a test where they played a high pitched sound and me and all the adults asked when you going to start, the kids looked at us and said you can't hear that.

Nope, I know I don't have that range anymore.

More than likely I would be able to.