Are there any restrictions for children at SEA LIFE London Aquarium? Children aged 15 years and younger must be accompanied into the attraction with an adult aged 18 years and older. Related articles Under 3s go free – how to book How much are tickets? Do you offer any concessionary rates? How old can you be to enter the attraction unaccompanied? 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?