After the founding of New China, it is required to popularize cultural knowledge, and all school-age children should go to school nearby in time, starting from the age of 7. Six years in primary school and three years in junior high school. According to this calculation, it takes nine years from the beginning of primary school to high school (in general, no repetition and no suspension), and the age of high school is 16. Of course, there are also individual cases, older and younger.