how many years do cats age
So at the end of her first year, your cat is approximately at the same developmental stage as a human that is 10 or 15 years old, and by age two, your cat will be around 25 in human years. âAfter that, cats tend to develop more slowly,â Barrack said, aging about four or five human years every 12 months. Putting your petâs age in human terms not only helps you empathize with your cat, it also show the importance of regular veterinary checkups.