How old must you be to enter SEA LIFE unaccompanied? SEA LIFE is suitable for people of all ages, however, if you are under the age of 13 you will need to be accompanied by an adult aged 18 or older. The Children's Play Area area is specifically designed for children aged 10 and under. Was this article helpful? Related articles Do I have to pay for a child aged 2 or under? Are there any restrictions for children at SEA LIFE California? Can adults visit SEA LIFE California Aquarium center without any children? What's include in a standard entry ticket to SEA LIFE California? I need to add, remove or change one or more of the people listed on the reservation. How can I do that?