Hey Bob,
I'm a few years behind you but the twisties hasn't seemed to slow me down any. If anything I may be pushing a bit harder now. That being said.... There is nothing that says we have to keep up with the kids. I ride as fast or slow as I want. I'm planning on riding this '06 GL1800 for lots of years and if that means not beating it quite as hard then I'll make that choice when the time comes...
BTW -- we had a gentleman in our small informal riding group that finally gave it up in favor of he new bride at age 91. He lived a couple more years but still hung with the "Kids"
Ride Safe!!!!!!!!!!!