I think it's wonderful that you're honoring cats in their precious golden years. Seeing videos of other cats who are still happy in their golden years warms my heart. I love my elderly kitties! I'm attaching a link to a video I posted on youtube this spring of my 20? year old cat Felixia. She moved into my home after she was abandoned by neighbors back in 1991. She already had bad teeth at that point, so she's at least 20 (probably older), but she still loves to play every now & then.
My little 20-year-old cat Felixia still loves to play. Here she is playing on the couch. Mr. Underfoot (14 years old) plays goalie on the floor.