For now get him is a short cage and cover the bottom with something soft like towels so he doesn't get hurt when he falls. A really good chameleon vet is a must when you have an aging chameleon. When my guys get older some of them got arthritis also and it caused them to fall so I had to put them on short trees (I free range everybody). They can get Adequan injections and Metacam for that and it helps allot. I also had one with high blood pressure, which caused his eyes to be puffy and hardening of the arteries and that caused him to have a stroke. They also get cancer. Basically they pretty much get everything that we do. It's important to have regular checkups, x-rays and blood work more often when they are older so you can stay right on top of everything.