You know that mosquito sound that teenage humans--but not adults--are supposed to be able to detect? Well, according to this thingy I clicked on, I can hear a pitch almost as high as some teenagers hear:

The teen repellent will no longer foil you, but you can still hear some pretty high tones.

The highest pitched ultrasonic mosquito ringtone that I can hear is 16.7kHz

Find out which ultrasonic ringtones you can hear!

(It's not true what it says here; I'm much older than twenty. But thanks for the compliment, answer generator!  Also, why does this switch from third person to first?)

I really can hear things very, very faintly all the way down to the 21.1kHz option, but not well enough that it would actually bother me or stand out above other sounds. 

What about you?  :-)