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? Do I need to book a time slot with my Merlin Annual Pass? What is the photo package available to purchase? Can I pre-book my visit in advance as an Annual Pass holder? I purchased my ticket from "insert third part seller here", how do I use it?