Buda, Up to a point, the brain does a wonderful job compensating for gradual hearing loss. The NIDCD hardly went out on a limb making that claim; I would wager that no one at the age of 65 or over has the measurable hearing acuity that he or she had at age 18. That would be zero persons. Anyway, nobody's perfect. On the other hand, experienced listeners develop skills that make them better judges of audio equipment, or not, compared to any 18-year-old.
What I decry is the Emporer's-new-clothes psychology that comes into play when there is hysteria surrounding a new product, such as the Amadeus. And now apparently we have Mr. Firebaugh quoted (above) as saying that some other newer turntable product is "the best he's heard". (Hope I got that right.)