Checking the age of a cat can generally be judged by the cat’s teeth. If the cat’s teeth look small, partially defective or part of the deciduous teeth are developing, then the cat may be in the young stage. If the cat’s teeth If the teeth are very long, have thick roots, or have dental calculus, then the cat is likely to be an adult cat. Moreover, X-ray examination of the cat's growth plate closure time can also estimate or confirm the cat's age, but it can only examine cats about 2 years old.