Cats age comparatively slower than dogs but still at much faster rates than humans. For instance, the first year of a cat's life is usually considered to be the equivalent of 15 to 18 years in a human, while a 2-year-old cat is about 24 in human years.
After a cat reaches the age of 2, every year after that is considered equal to about four years in humans. This means that a 3-year-old cat is 28 human years old, a 4-year-old cat is 32, and so on.
Cats usually begin to show some signs of aging and may start to develop more health problems around the age of 10, which makes sense as it is equal to age 56 in human years. The maximum age for most cats is between 16 and 20 years, although there are sources that claim the oldest cat in the world lived to the age of 34. If this rumor is true, this age would equal a remarkable 153 human years old.
Some breeds of cat are known to live longer than others, with Siamese and Manx breeds typically having the longest average lifespan. In addition, most estimates suggest indoor cats typically live more than twice as long as those who spend a lot of time outside.