Do I have to pay for a under 3 ticket? No, you do not have to pay for anyone under the age of 3 years. Everyone aged 3+ years requires an entry ticket. Related articles How old is a child ticket for entry? Under 3s go free – how to book Can adults visit LEGOLAND Discovery Centre Manchester without children? Covid-19 re-opening from 17th May 2021 Is LEGOLAND Discovery Centre suitable for children?