Not a big idea but as Snowball has aged she more prefers rolling around while playing rather than running and jumping. I'm not sure how much this is linked to physical decline or just more of a behavioral change as she seems to have no problem getting around outside. But anyway, she also loves boxes or anything enclosed. I got a new cat bed house with an hanging puffball and she loves it. It's the perfect little place for little old ladies (and guys) to roll and flop around while playing.
I have a few who love dangley toys. Age doesn't seem to play into it. Barbossa one of this year's kits loves some dangley crochet toys. Mimsy who's my senior also plays with them...just seems to be personal preference. Adorable video <3 ciao