That's a downer, but I guess that day will come to all of us eventually.
Something worth considering is a smaller, lighter, machine which is easier to manoeuvre and start. A lot of the VMCC members seem to be taking that route, although it's probably more feasible in the UK with lots of smaller lanes and back roads.
Even a modern lightweight with electric start is still a motorcycle.
Come to think of it, I was talking to an older gent quite a while back who told me his "twist and go" super-scooter (Suzuki Burgman?) had extended his riding life by years.