Up to now, there is no reliable scientific method for calculating exactly how old the cat is in human years. Many similar formula found on web, which having some differences. By summarizing those differences. You may use this formula to calculate cat's approximate age in human years on the comparison chart below.
Generally speaking, the first year of a cat's life is roughly equal to the first 15 of a human’s, and the second year of a cat's life is roughly equal to the first 24 of a human’s.......