I vet friend recommended I get this arthritis medicine for our 15/16-ish year old cat (he's a rescue we dk for sure). You have to inject it with a needle yourself which kinda freaks me out cause I don't want to miss. its also $50 a month which is not cheap but not the worst.
The results are amazing though, he has so much more energy, can jump better, plays more. Hard rec for those with 9+ yr old cats.