Andrea Burns was the first person to come to mind, actually, but I imagine they are looking at younger actresses for the role. Burns would NAIL this part though, and it would be such a treat to see her in it.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"