msk- I think you will do fine for a while. I don't do very long rides. I like to get out on a twisty mountain or canyon road early on a weekday so there is little or no traffic and do my best Marquez imitation (actually not even close). If I can get all the way to the top of the mountain and back without seeing a car, it's a good day.
I've ridden from coast to coast and Southern border to Northern border multiple times, but when I was much younger....not anymore....but Sport Bikes were not meant for touring anyway. So far I haven't had any real physical limitations, but who knows how long????
You know the best thing for older folks is "Just keep moving".