Are there any restrictions for children at SEA LIFE London? Children aged 15 years and younger must be accompanied into the attraction with an adult aged 18 years and older. Related articles Do Under 3's need a ticket? 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? How old can you be to enter the attraction unaccompanied? Do you offer a family discount? Do you have a re-entry policy?