How old is a child ticket for entry? To receive a child rate you must be between the ages of 2 - 12 years old. Children 1 and under receive free admission. Related articles Can adults visit LEGOLAND Discovery Centre Toronto without children? Do I have to pay for a under 2 ticket? Can adults visit LEGOLAND Discovery Centre without any children? What is an Individual Admission Ticket? What is the LEGO Collectible?