Do I have to pay for a under 3 ticket? No, anyone under the age of 3 goes Free at SEA LIFE Manchester. Related articles Are there any restrictions for children at SEA LIFE Manchester? Can I buy tickets online for the same day? Is my 2 for 1 voucher valid at SEA Life Centre Manchester? What is a SEA LIFE Parent and Toddler ticket? How do I redeem a 2 for 1 voucher at SEA Life Centre Manchester?