I think it depends upon the personality of the cat and I would think also their living circumstances, other pets, people to play with, etc. It seems that in my reading about cats, breed may even have some influence. My Wallace, who is almost 2, is totally still very active and kitten- like and Marcellus, who is the same age, although much more sedate, still has his kitten moments and that would be when he plays with the other cats. I think if he didn't have other cats to play with he would be a total couch potato; he'd be much fatter too! And then Lewis, who is 7 months....well, he's still a kitten and EVERYTHING is still a toy!!