What does the 23rd year of descending to earth mean?

It describes this person who has lived for 23 years.

The 23rd year after descending to earth is mainly a joke on the 23rd birthday, indicating that oneself or others are already 23 years old.

Going down to earth is a term used in traditional Chinese mythology. It mainly describes the behavior of gods in heaven coming to the human world. In mythology, it refers to the arrival of gods into the human world. Among the people, if a woman's appearance is described as very good, she will be said to be like a "fairy from heaven". If someone has abilities that are beyond the reach of human beings, they will also say that he must be a "god descended from the earth."