John,
Its great you have found a sport (squash) that seems to fit your circumstances in life. Is it possible, however, that it appeals to you more than some old standby sports because it is the one in which you are improving? Unlike all your other sports, the way you are playing now is near the top of your game. You know you are past that in the other sports you've played for decades. Continual improvement is a good motivator.
WOB
By Frank Murtaugh
Re: “Racquetball: A Cautionary Tale of a Sports Boom”
"It quickly replaced handball because ... women could learn it quickly."???