How old is kitty in human years?

Could you please provide some context about "kitty" before I attempt to answer your question? Without knowing the breed, size, and other relevant factors of the feline in question, it's difficult to give an accurate estimation of their age in human years. However, if "kitty" is a domestic cat, I can generally say that the conversion ratio between cat and human years is not linear. The first two years of a cat's life are roughly equivalent to the first 25 human years, and then each subsequent year of a cat's life is roughly equivalent to 4 human years. So, if "kitty" is 3 years old, they would be roughly equivalent to a 29-year-old human. But again, this is just a rough estimate and may vary depending on the specific cat.