How old is your cat?

We have all heard that one dog year is the equivalent to seven human years, but what about cats?  Cats develop quite quickly when they are young.  In fact, a one year old kitten is the equivalent to a fifteen year old human.  The aging process then slows considerably, as a four year old cat is equivalent to a 32 year old human.  The aging and life span of a cat then varies considerably depending on lifestyle, breed, diet, exercise, and veterinary care.