Although compulsory education goes from age 6 to 16 on average across the OECD, the enrolment rate is high in a wider age range, and at least 90% of the population is enrolled for 14 years, from age 4 to age 17, on average. The age interval is generally shorter for OECD partner countries, and full enrolment (defined in this indicator as enrolment rates exceeding 90%) can be as long as three years, as in South Africa, or four years, as in Colombia. Enrolment at even earlier ages is relatively common in some countries, with Denmark, Iceland and Norway achieving full enrolment for 2-year-olds (see also Indicator B2). In other countries, full enrolment is achieved for children between age 5 and age 6, except in the Slovak Republic where full enrolment is achieved at age 7.