This page has a list of countries by Official entrance age to compulsory education (years), according to officially-recognized international sources compiled by the World Bank. Official age when students should enter compulsory education assuming they start at the official entrance age for the lowest level of education, study full-time throughout and progressed through the system without repeating or skipping a grade. The theoretical entrance age to a given programme or level is typically, but not always, the most common entrance age.