Colorado Revised Statutes Title 22. Education § 22-1-115. School census--school age

A school census is a census embracing all persons between the ages of five and twenty-one years. School age is any age over five and under twenty-one years; but any child attaining school age during the school year may be admitted to school subject to the requirements for admission fixed by the school board of the district in which he or she applies for enrollment.