If I am 16 years old but would like to bring my friends who are 15 years old, can we go into the attraction without an adult? Children 15 and under must be accompanied or supervised by an adult, prince or princess aged 18 years or over. Related articles Under 2s go free – how to book Is there a maximum age restriction? Are there any restrictions for children at Shrek's Adventure London? I'm a Merlin Pass holder, do I need to pre-book? How old can you be to enter the attraction unaccompanied?