Joseph, here's another idea, though touchy to broach also:
As one plays harder and harder on the piano through the years, the hearing becomes deafer and deafer, leading one to have to play harder and harder, etc. A vicious circle.
If he's not already using a hearing aid, delicately suggest it. Some audiologists offer free hearing tests from time to time. That way he can turn the volume up louder and louder to help prevent playing harder and harder and avoid breaking and breaking of strings!
Wally
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