Generally, cats are one of the longest-living animals for their size. The reason is that it seems to be proportional to the animal's size- with a few exceptions like tortoises, man, and certain other animals.
The lifespan of a small mouse is short, while the life span of a rabbit is slightly longer, and that of your average dog to be between 7-20 years or more depending on its breed and size. A cat's life span may only be about eight years, but it can live up to 12-14 years old, which isn't uncommon for those fortunate enough to reach their late teens or even early twenties.
Cats Have 6 Life Stages
International Cat Care has put together a preventative healthcare initiative called Cat Care for Life. The program looks at the health checks your cat should be having depending on its age and what changes in behavior you can expect as it ages.