Is this high pitch or low pitch?
Try the “mosquito” test (the electronic device, not the insect). You’re not supposed to be able to hear it if you’re over 30, but that’s just on average. Don’t put the speaker next to your ear – it’s still there even if you can’t hear it.
There’s another one that gives you a range from high to low over a period of 10 or 15 seconds, and if you try it out on people of different ages they’ll most likely say they start hearing it at different points.