My cat Jesse recently turned 17 and, while he has slowed down in the past few years, he's still a relatively healthy kitty and I'd say he's doing pretty good for an older gentleman. Cats are considered “senior” between the ages of around 11 and 14, and “geriatric” by age 15. If you're like me, you've noticed that your senior cat might be sleeping more and moving around a little less and that's pretty normal. However, it's really important that you pay special attention to your older cat and make sure his needs are met. And of course, a cat's physical, mental, and emotional needs change over time. But if you keep a few simple things in mind, your kitty can enjoy a long and healthy life!