The improvement of education is a government priority and disparities between rural and urban facilities are being addressed with the building of more rural schools, and other reforms. Primary and secondary education is free and coeducational. Primary schooling lasts five years, secondary education three, and, in theory, schooling is available until the age of 17. Nearly all children complete the primary level, and an estimated 54 per cent (1992) go on to the secondary level. In Turkish secondary schools, it is the teachers (rather than the children) who go from classroom to classroom. Once children have completed secondary school, they take an exam to determine entry to university. Turkey has more than 29 government-funded universities, the oldest of which was founded in Istanbul in 1453. There are nearly 600 specialist colleges and institutions offering vocational and further training.