The teenager-only frequency
17 kHz earned cultural fame twice: first as the "Mosquito" anti-loitering device, which played tones around 17.4 kHz outside shops to annoy teenagers whom adults couldn't hear being annoyed; then as the teen countermove - "silent" ringtones near 17 kHz that students heard and teachers did not. Both exploited the same steep age curve: hair cells for the top frequencies wear out first, and by the mid-twenties most people have already lost this one.
The full phenomenon, with a playable range of these tones, lives on our mosquito tone page; the step-by-step version that estimates your ears' age is the hearing age test. This page is the single reference tone for the most famous frequency of the bunch.
If you hear it (and if you don't)
Hearing 17 kHz clearly at moderate volume suggests young or well-preserved ears - a ceiling worth protecting, since the same exposure that erodes it eventually reaches the speech frequencies. Moderate headphone volume and earplugs at loud events are the whole protection program.
Not hearing it after your twenties is textbook-normal and musically costless - effectively no musical content exists above 16 kHz beyond faint air. Before concluding anything, though, verify your hardware: plenty of speakers and lossy streams roll off before 17 kHz, and this tone specifically is a common casualty of low-bitrate Bluetooth codecs.