I believe our brains retain the experiences of listening in our younger years and "fill in" the missing frequency information even when our ears no longer detect them. We know what full range music sounds like and that knowledge is recalled by the overall sound such that we don't notice the missing frequencies.
Aging ears and Nuances
I spoke to and older audio buddy of mine and he made a full 180 on his nice tube gear and just went with lower cost streamer that can also be used as a preamp. He says he doesn’t hear much above 11.5k. My tests let me hear up to about 13.5k but I’m able to hear even subtle differences between tube amps etc quite easily even though most of the music is in lower frequencies of the spectrum regardless. Does anyone here find themselves experiencing a more difficult time appreciating the nuances with their age? And has it affected the choices you have made with gear, not being as picky?