It can be judged by the thickness of a cat’s fur. As a cat gets older, its fur thickness will change accordingly. The age of a cat can be determined by examining its vitreous body. The younger the cat, the clearer its eyes are. The most intuitive judgment is to observe the changes in the cat's body shape. For example, young cats will be thinner and more muscular, while middle-aged and elderly cats will be more plump. ​​​​​​

As a cat gets older, its fur thickness will change accordingly. Young cats will have thicker subcutaneous fat than older cats, so the fur will be more comfortable to the touch, and the fur of young cats will be smoother. If it is shiny, the touch of older cats will be rougher, and the fur of older cats will grow gray and white miscellaneous hairs.

A cat’s age can also be determined by examining the cat’s vitreous body. As a cat ages, its eyes change from clear to gradually cloudy. Clear and bright eyes indicate that this is a young cat. The eyes of older cats will become cloudy and even develop cataracts as they age.

One year of a cat’s life is equivalent to eighteen years of human life, so a cat is considered an adult after one year of age. After that, every year the cat grows older is equivalent to four to five years older in humans. When a cat is six years old, it is equivalent to when a person is forty years old and is about to enter old age. The age of a cat is also related to its living habits. Generally speaking, cats living indoors will age more slowly than cats living outdoors.