Do I have to pay for a under 2? No, children under the age of 2 will not need a ticket for entry into LEGOLAND California Theme Park or SEA LIFE Aquarium. Children aged 2 years old and over will need a ticket to enter either attraction. Was this article helpful? Related articles How old must you be to enter SEA LIFE unaccompanied? If I buy a one-day ticket, can I add on a second day at the Park? Do I have to pay for a Toddler (1 Year Old) to visit the Water Park? Can I buy tickets for a same day visit to SEA LIFE California? What does a SEA LIFE Hopper or Resort Hopper ticket mean?