In most European education systems, compulsory education/training starts at the beginning of primary education (ISCED 1), usually at the age of 6. In 15 education systems, attendance at last year(s) of pre-primary education, usually at the age of 5, is already compulsory. […] In most European education systems, full-time compulsory education/training lasts 9–10 years ending at the age of 15–16 (European Commission/EACEA/Eurydice, 2016, p. 3)