Generally 22 years old. The admission age stipulated by the state is 7 years old, 6 years in primary school, 3 years in junior high school and 3 years in senior high school. 18 years old goes to college and graduates at the age of 22. If you study in a junior college for three years, you can graduate, and the graduation age is 22. Most undergraduate majors are four-year, but there are also some five-year majors. For example, medicine, architecture, urban planning and landscape architecture design are all five-year majors.