Sidney does not want to play with me very much anymore. He started turning down play last summer for the first time ever,  and now he just doesn't want to play. He will be nine in June. My mother and I took him to the vet who very kindly suggested a bunch of tests (cha-ching), and the end result of that is that there is nothing wrong with Sidney physically. So, unless he's depressed (and who could blame him, living in Pittsburgh where there are no geckos to hunt), then it's a simple matter of him aging. I don't know. He never, ever didn't want to play. And now he doesn't play. He just sleeps most of the day.