Is there an age chart for cats that gives the human equivalent?
There’s really no reliable scientific method for calculating exactly how old your cat is in human years, because they all develop at rates different than humans. For example, some people suggest that each cat year is the equivalent to seven human years but, in actuality, a one-year-old cat is much more mature than a seven-year-old child.
In general, however, veterinary experts agree that the first two years of a cat’s life are roughly equal to the first 25 of a human’s life. Thereafter, each additional year equals approximately four ‘cat years.’ This is based on the comparative ages when cats and humans reach maturity. Cats reach sexual maturity by the end of their first year.
To calculate the age of your cat, first determine how many calendar years your cat has been alive. Start with 15 human years for your cat’s first year. Then, allow nine more years for the second year of your cat’s life. These numbers are just approximations and may depend on the breed of cat.
After that, include four years for each of your cat’s subsequent years. There is still a fast rate of development compared to humans, but less so than in the first two years. Finally, add all the numbers together to determine your cat’s age in human years. Consider using a calculator to simplify applying this formula to figure out the age of your cat in human years.
The best thing to do is to speak to your veterinarian for an accurate calculation specific to your cat.