I used to be able to hear monitors whine and I'd have to unplug them completely. Can't anymore; I thought it was because I was getting older and my hearing at t

I used to be able to hear monitors whine and I'd have to unplug them completely. Can't anymore; I thought it was because I was getting older and my hearing at the higher frequencies was dropping off. Still got one of the monitors I used to be able to hear whine and I can't hear it anymore. Seems odd that there are older people who can hear the high-pitches when younger people can't. Maybe the kids are tuning it out.