Aging ears and Nuances

I am 73 and have found no reduction in my ability to characterize and discern nuances in high end systems. Overly trebly, hard and distorted high frequency bother me as much as ever.  

All the nuances of the midrange are still there. I know my high frequency hearing is not as good as it used to be, but my experience listening seems to have made up for it. When I listen with younger folks, our observations are the same as we compare notes. Also, high frequencies affect lower frequencies, so if you get them wrong the overall sound is negatively affected. 

I also get to listen to different systems... some of lower quality and some of higher quality... and of different character. The differences are instantly obvious. 

I believe all of you. However, one sign of agedness among some of the faithful gathered hereabouts manifests in our tendency to repeatedly hash over old arguments like a bunch of old duffers sitting around the pickle barrel in the general store. Wouldn't have it any other way. Sometimes if an old argument is sampled daily for centuries it can turn into something magnificent to behold - something entirely unexpected.

According to the VA I have lost a bit at both ends of the spectrum. Nothing too bad. 
My problem is not what I cannot hear. It is what I do hear. 
All that said being in my 70’s with a myriad of issues I had to downsize to equipment I can physically handle. Moving around 100 pound amps and speakers is simply no longer an option. 
A word of advice… please do not ever tear your quad tendon off the bone. 

My high frequency hearing isn't as good as it was when I was young, but I can still hear the most critical music ranges quite well.  In my 60s, even with less than youthful hearing I am a more experienced and patient listener and am more adept at identifying nuance and subtle changes than when I was young.  

There is an awful lot more to music reproduction than high frequency bandwidth.  In my experience you can enjoy quality music reproduction and hear subtle component differences as you age despite a gradual loss of high frequency hearing.

As other posters have noted, with experience you also learn to be a better listener.