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? If I buy a combo ticket, do I have to visit SEA LIFE on the same day? What are the standard ticket prices to LEGOLAND California? What are your tickets Terms and Conditions? Do I have to pay for a Toddler (1 to 2 Years Old) to visit the Water Park?