How old can you be to enter the attraction unaccompanied? Guests aged 15 years and under cannot enter Sea Life Melbourne without a parent or guardian aged 18+ accompanying them. Related articles What age is classed as a child for a Combination Ticket? What time does the party start? Am I eligible to redeem the Merlin Annual Pass Renewal rates as a SEA LIFE Annual Pass holder? How can I contact Customer Services? Do you offer a concession rate?