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I'm 45 and I tested the tones out with my 16yr old beside me. I could hear the 15khz but not the 16. My son said that he felt more than heard the 16khz. Neither one of us could hear the 17, so we stopped there. I think I'll go back and try the others just to see if it's just a certain range that I can't hear. I'm careful about the volume level of radios, TV, etc. in our house, including personal headphones/earphones.
I tried all of this on my DELL laptop speakers (less than a year old) with the volume cranked up, but I think I'll take the ideas posted here and try some external speakers.
My wife is younger than I am, but she couldn't hear the 15khz. She wasn't too happy.
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