How to calculate the age?

According to the Gregorian calendar, from the second day of the first birthday.

Age calculation method:

Article 2 of the Supreme People's Court's Interpretation on Several Issues Concerning the Specific Application of Laws in the Trial of Juvenile Criminal Cases clearly stipulates that "one year old" is calculated according to the Gregorian calendar year, month and day, starting from the second day of one year old birthday. The reason for delaying the calculation by one day is out of consideration for human feelings and to minimize trouble. (It is the cardinal number, so you can also calculate the mantissa, such as three years and two months, seven and a half years old, etc. )

In China, in order to distinguish it from the traditional way of calculating age, that is, calculating the order (ordinal number) of years after birth, there are two names: one year old and nominal age.

Extended data:

Imaginary age is a traditional method for calculating age in China, and it is also popular in other East Asian countries. It is used to calculate the sequence (ordinal number) of years experienced by a person after birth. Birth is one year, because it is the first year after birth, and it has nothing to do with the pregnancy time he experienced.

The calculation method of nominal age is: one year old at birth and one year old after the Spring Festival every year (beginning of spring in ancient times). However, some people are two years older than their full age, and this algorithm is divided according to the first half and the second half of the year of birth. The imaginary year born in the first half of the year is only one year older than their full year, and the second half is two years older (solar or lunar calendar).

Baidu encyclopedia-one year old

Baidu encyclopedia-nominal age