There are many answers to this question. Generally speaking, except for postgraduate entrance examination, undergraduate and junior college students are almost 2 1 to 22 years old.

Basically, after they come out of this age, they have to practice because most of them are 18 years old to take the college entrance examination, and then study in the university for about 3 or 4 years, which is almost 2 1 to 22 years old.