Foundation Stage is the British government label for education of pupils aged 2 to 5 in England. In Northern Ireland, it is also used to refer to the first two years of compulsory education for pupils aged 4 to 6. Foundation Stage is the British government label for education of pupils aged 2 to 5 in England. In Northern Ireland, it is also used to refer to the first two years of compulsory education for pupils aged 4 to 6. Foundation Stage 1 takes place in a pre-school / childcare environment such as Nursery between the ages 3 and 4, but is non compulsory education. Foundation Stage 2 takes place in the Reception class of an Infant or Primary school between the ages 4 and 5. It is also known as Key Stage 0 to fit in alongside key stages 1 to 4.