The news about teens being able to hear certain frequencies well below what adults can hear is nothing new. I did think it was was rather clever, using those tones as ring and text tones to avoid detection by adults. Ever wondered where your cut off point is? I did and stumbled across this site. You can play several ranges of ultrasonic tones at the following site and even download them for your own use:
I don’t think I did very well. At 15.8kHz my sensitivity cut out. After that, I can only percieve the slightest whine and even then only without distractions. After 19.9kHz I got nothing at all. To be certain you are testing yourself correctly, you should here a sharp, crisp whine, NOT a hum or static (that’s generally an audio relic of the mp3 quality). Good luck, bat-people.