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 2 and under? Are there any restrictions for children at SEA LIFE California? Do I have to pay for a under 3 ticket to SEA LIFE? What are the standard ticket prices to LEGOLAND California? How can I contact you?