"As far as range of hearing as we get older goes, I remember having a discussion with a guy who was actually research studying it a long time ago and he told me something along the lines of "no musician in a horn section over the age of 40 hears anything above 6K".
Different process than aging—it's like evel knievel's doctors suspecting he had osteoporosis because he had so many broken bones (Guinness Book of World Records at 433).