One of my colleagues has a new ring tone from here: Ultrasonic Ringtones. He’s got the 14.1kHz tone, which is the highest he can hear reliably. I tried listening to the sounds on my headphones, and found that my hearing was dropping off at 14.9kHz and I couldn’t hear 15.8kHz at all. It was then that I realised that I’m nearly 29, and definitely meeting the requirements for what my younger self would consider ‘old’.
I was thinking about it a bit more on my cycle home — I’ve got a wife, three kids, a house (with mortgage), two cars (one’s for sale, anyone want an Alfa?), a cat and six goldfish. I think I can probably allow myself to be considered at least a little bit old :). Then I got home and found that I can actually hear the 15.8kHz tone quite easily through my speakers. So that’s all right then.
Where are you hiding the sixth goldfish? Or are you developing senile dementia?