This lady is 64 and she completed 100 miles at Iranmarathons May Flowers event:
She did it in 39 hours. Much of her walking was on her own. What mental fortitude that is.
For myself, no I have no intention of doing 100 miles all in one race. This is not my quest. I did find however that doing 2 marathons in 2 days did scrape the bottom of my barrel in some sense. I drank my dregs. I was empty. Its not the same sort of dregs that a 100 miler feels.
Here is my finisher picture: