(Or elementary education) Consists of the first years of formal, structured education that occurs during childhood. In most countries, it is compulsory for children to receive primary education (though in many jurisdictions it is permissible for parents to provide it). Primary education generally begins when children are four to seven years of age. The division between primary and secondary education is somewhat arbitrary, but it generally occurs at about twelve years of age (adolescence); some educational systems have separate middle schools for that period.