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 Do I have to pay for a under 2 ticket? Do Adults need to buy a ticket or just the Children? Can adults visit LEGOLAND Discovery Center Westchester without children? Is LEGOLAND Discovery Center Westchester suitable for adults? What is the difference between a LEGOLAND Theme Park and Discovery Center?