One more sign that I'm not as young as I used to be

One of my students held up a Razr phone yesterday. She asked me, “Can you hear this?”

“No.”

She tried again. I still couldn’t hear her phone.

Another student asked, “Is that why you have your phone set to that awful high-pitched tone?”

“Yes, people over 25 can’t hear it.“

He said, “Mrs. V can hear it and she’s definitely over 25. But then, she can hear everything. You’d better not say anything in her classroom that you don’t want her to hear.”

Is that “teacher’s hearing?” If so, I definitely could use it.