How old is a child ticket for entry? To receive a child rate you must be between the ages of 3 - 12 years old. Related articles Do I have to pay for a under 3 ticket? What is the LEGO Collectible? What is a LEGOLAND® Discovery Centre Toronto Annual Pass? Can adults visit LEGOLAND Discovery Centre Toronto without children? Do you offer a family discount for a LEGOLAND® Discovery Centre Toronto Annual Pass?