Me (58) - I can't hear the frequencies, but I can hear the dBA changes/timing as well as ever and as well / better than my kids.
What that means in my brain, I do not know. If I leave my upstairs tube amp on in headphone mode to burn in - and go downstairs I hear it. I hear 1-2 dBA changes. Kinda humble bragging but it is almost a problem. I can't tune stuff out so well. I don't remember hearing any of this stuff till 40+ when there were other priorities. I understand my parts may be worn, but my perception is peaked. Some of my stuff does not sound as good as my 30 year old Bose stuff - but in my stuff I can hear every word. It is difficult to say which is better.
At the time we lived in a place with raised hardwood floors. I didn't think about it, but there was great sound for little cost. Reproducing that Costco Bose system on those floors is easily 10X the price now.
What that means in my brain, I do not know. If I leave my upstairs tube amp on in headphone mode to burn in - and go downstairs I hear it. I hear 1-2 dBA changes. Kinda humble bragging but it is almost a problem. I can't tune stuff out so well. I don't remember hearing any of this stuff till 40+ when there were other priorities. I understand my parts may be worn, but my perception is peaked. Some of my stuff does not sound as good as my 30 year old Bose stuff - but in my stuff I can hear every word. It is difficult to say which is better.
At the time we lived in a place with raised hardwood floors. I didn't think about it, but there was great sound for little cost. Reproducing that Costco Bose system on those floors is easily 10X the price now.