Age calculation method: Nominal age (also called gross age): one year old at birth, increasing by one year every Spring Festival. One-year-old: born at the age of zero, one year older every Gregorian birthday (even birthday).

The specific conversion method is as follows: from nominal age to full age: before my birthday comes, full age = nominal age-2; On and after the birthday, one year old = nominal age-1.

Conversion from one year old to nominal age: before my birthday, nominal age = one year old+2; On and after my birthday, nominal age = one year old+1.

Extended data:

The story of the zodiac:

Xuanyuan Huangdi wanted to choose twelve kinds of animals as court guards, and the cat asked the mouse to sign up. As a result, the mouse forgot, and since then, the cat has been seeking revenge when it sees the mouse. Originally, the cow pushed first, and the mouse sneaked up the cow's back and took the lead. Not convinced, the tiger and dragon were named as mountain gods and sea gods, ranking behind cattle. The rabbit refused to accept it and wanted to race the dragon. The rabbit ran in front of the dragon.

The dog was so angry that he didn't want to bite the rabbit that he was finally punished. Snakes, horses, sheep, monkeys and chickens also went through some contests, and finally pigs came to occupy the last position.