tcamiga,
Well done on remaining so healthy. I think you may be correct regarding good brain activity. Although I’m now retired from flying, my main hobbies are to do with vehicles in one way or another (these days obviously ground based) and most of my friends and acquaintances are similar people. I’ve often wondered if maintaining motor skills (in all senses of the term) and good hand/eye coordination keep brain degradation at bay for longer. Because like you, I’ve noticed that bike riders keep relatively “sharp” for a very long time. I’ve also wondered if video games such as the traditional “Space Invaders” have a similar benefit because they presumably make the brain process multiple items at once.