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? 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? How much are tickets to SEA LIFE London? What happens if I can no longer make the time/day of my booking?