'Everyone' tells us that hearing deteriorates with age......
I don't mind people knowing that I'm 67 years old (yes, I've been in the music business for nearly 50 years!!) and I don't notice any difficulty in evaluating the finer points of mic pres, microphones, compressors and monitors.
I believe you are quite right about there being much more to 'hearing' than those parameters that the audiologist thinks he can measure.
The day someone calls me out for being deaf I shall think again, but so far, I'm quite happy!
(pardon?)