The school is near to Westminster Abbey in central London. It existed before the 12th century. The school's notable ex-students include Nick Clegg, Ben Jonson, Robert Hooke, Christopher Wren, Jeremy Bentham, and A. A. Milne. Boys enter the Westminster Under School when they are seven years old. They go to the main school when they are thirteen. Girls are allowed only at sixteen. The school has about 750 students. About a third are boarders (who live in the school). Most of the boarders go home for the weekends, after Saturday morning school. The school has eleven houses.