Education in the UK is compulsory from ages 5 to 16. During primary school (ages 5-11), students attend state schools, which are publicly funded and make up 95% of schools. From ages 11-16, students may attend grammar schools or comprehensive secondary schools. After secondary school, many students take a gap year before attending a university. There are over 90 universities in the UK now, educating over 1.1 million students, compared to just 20 universities prior to 1950. Universities are categorized based on their founding dates, with Oxford being the oldest dating back to 1167. The Open University is unique as it offers distance learning without requiring classes on campus.