How old can you be to enter the attraction unaccompanied? Children aged 15 years or younger must be accompanied by an adult aged 18 years or older into the attraction. Related articles Are there any restrictions with an Adult and Toddler ticket? Why do you not have a child rate? How do I purchase friends and family tickets for SEA LIFE Birmingham? I have a unique code from The Sun - how do I redeem my tickets? Can I purchase tickets on the day?