Test your Ears! Can you "still" hear it?

[Navane]

I couldn't hear the last two, and I'm 22. I guess always listening to headphones has damaged my ears for some reason. But like another poster said, I don't see how it's a big deal not hearing these super high frequencies. We'll never hear them in nature, so I don't see how not hearing these high frequencies affects are ability to clearly hear lower frequencies.