My grandparents (now 90+) didn’t care much when I would change their distro, they are currently on Tumbleweed (just bcs thats what I decided to run on everyones computer I’m asked to maintain).
I would keep their general experience about the same for their use case (same desktop/desktop dock shortcuts, same browser ofc).
But yeah, Fedora (def Silverblue) or wherever you are familiar with.
(Lol, I never actually tried Mint myself, but that too - like a modern Ubuntu alternative)
Rofl, I did have this random shower-though before