College students who graduated in 2023, 22 years old. According to China's education system, the age of primary school entrance is 7 years old, including 6 years in primary school, 3 years in junior high school and 3 years in senior high school. Under the condition of meeting the normal years of education, a person needs to graduate from primary school 12 years (7+6+3+3= 19). According to this calculation method, 18 years old can complete the junior college or undergraduate course at the age of 22 and get the corresponding diploma.