This is weird: some old fart create a tone to keep the youngsters outside, and this turn out as a ringtone unhearable by the old farts.
So, what is the highest frequency you can hear? Follow the link. Be careful not to thread too long in the "silent" region, is it likely to give you nausea.
P.S.: I hear clearly 15000 Hz, a bit less 16000 Hz, nothing at all from 17000 Hz and up.
P.S. #2: if 440 Hz is the frequency of a diapason (La3 or La4, depending by your side of the Atlantic Ocean), so 3520 Hz is the last La of a piano keyboard. We can assume no music plays above 14000 Hz.