I appreciate all the comments thus far, and am interested in whatever anyone else has to say on this topic. Here is some feedbajck on people's comments thus far:
1. I agree that I should stop when I no longer enjoy riding. Thus far, I continue to enjoy it immensely, and know that if I quit now I will long for it everyday.
2. I don't see me becoming part of the Goldwing set. A new Concours 1400 would be far more interesting.
3. A big part of the fun of riding is the responsiveness and reaction of the bike in the turns, as the g forces pull you down into the seat as you lean through a turn. That would be gone with a trike, or a sidecar rig. Maybe when I am 85, but not before then. I am slightly old, not dead.
4. Reducing the motorcycle commuting is something I might consider, when the time is right. Right now, I still enjoy that.
5. Yes, this is all related to the angst I feel after reading about Craig Hightower's untimely death. While that situation may have been entirely the sole fault of a careless SUV driver, and thus outside of Craig's control (a fact which we may not ever be able to verify), I cannot help but wonder if even the slightest amount of physical degredation that comes from ageing might make the difference between life and death if I were in his place.
6. Despite the attitude that some may have picked up from my original post, I am by nature a highly positive person, who generally lives in the moment in order to fully enjoy the experience of life. I motorcycle, I ski, I enjoy time with my children, and I fight intense battles in the courtroom. That said, I also owe it to my family not to act like a maniac. I am trying to determine the appropriate balance between risk and benefit, and am honestly facing the fact that in motorcycling the risk measurement changes as I age. I face situations in life head-on, and see no reason to go forward in denial of the facts.
Please keep this discussion going -- I am sure others have things worthwhile to contribute.