Do I have to pay for a under 3 ticket? No, anyone under the age of 3 goes Free at SEA LIFE Grapevine. Related articles Can I take a stroller or buggy around SEA LIFE Grapevine Aquarium? Are there any restrictions for children at SEA LIFE Grapevine? What is a combination ticket? Do you offer AAA members a discount? How old must you be to enter the attraction unaccompanied?