Cat years

       Q: Great site. I'm trying to find out the ratio between cat years and real time.
       Blu was born Aug 1st 1980. She is slowing down rapidly, and I was wondering
       what her age would be if she were human.

       A: Michael-

       I do not know if anyone publishes a comparison of cat years vs. human years
       as can be found for dogs.

       My best estimate is this:  the first year of a cat's life is probably
       metabolically equivalent to about 13 to 15 "human years". The next year is
       probably equivalent to another 10 or so years. After that, each year is
       probably close to the metabolic equivalent of about 4 years for a human.

       Using this reasoning, an 8 year old cat is roughly equivalent to a 49 year
       old human. a 20 year old cat would be equivalent to a 97 year old person. I
       am not sure that this reasoning is really valid but it is the best I can
       think of.

       Mike Richards, DVM