My old boy is 17 and very arthritic. Most he does is sit and purr recently.
last couple of days he has struggled to get doen from the sofa, he's made the leap but his back legs won't support him. He makes it upstairs to his tray.no accidents, but at the moment Ive carried him up to my bed where we are having a cuddle, because otherwise he is more or less static all day.
I guess Im just feeling sorry for him.