Do I have to pay for a child under the age of 3 years old? No. DreamWork's Tours: Shrek's Adventure! London does not charge for children under the age of 3. Related articles Are there any restrictions for children at Shrek's Adventure London? Is there a maximum age restriction? I'm a Merlin Pass holder, do I need to pre-book? How much are tickets to Shrek's Adventure London? How do I redeem a 2 for 1/Promotional Voucher?