How to calculate the nominal age?

According to the tradition in China, a year is called a year from the beginning of the Lunar New Year to the New Year's Eve of the twelfth lunar month. But fortune tellers have another algorithm. The eight-character arrangement takes beginning of spring as the dividing point to change the year. Knowing this rule, it is very convenient to talk about nominal age. -As long as you have lived in this year, whether it is one day or 360 days (one month more in leap year), it is 1 year. For example, a child was born on New Year's Eve. He will be 2 years old on the first day of the next day, but he will still be 2 years old on New Year's Eve this year. Another child was born on New Year's Eve. He will increase by one year. This is the whole concept of nominal age. In the old days (ancient times), there was no distinction between nominal age and nominal age, and there was no entanglement. Just because in modern times, children celebrate their birthdays, adults rank according to seniority, the elderly retire and so on. They are all calculated according to the age of one year in the solar calendar, and the situation is more complicated, and there is also a entanglement of imaginary years. In addition, don't simply say that the imaginary age is several years older than the real age. It's not hard to find.