I'm 36 years old and I recently measured how high of a frequency I could hear, and I can still hear up to 14.9KHz. I can't wait for that number to drop, actually, because there is absolutely no use in hearing such high frequencies. Quite to the contrary, when there's a broken electronic appliance at a café or bar or something, I'm always terrified of the clerk not hearing it and thinking I'm imagining it, or at any rate finding themselves unwilling or unable to do anything about it. It's horrible. There really is no point in hearing frequencies above 8-9KHz or so.