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13 is usually the set age requirement for massively multiplayer games, cant remember what it is on the app store, but its usually a rule of thumb, its not really written in stone as you cant really enforce it as you dont know the players real age.
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It's illegal to own somebody under the age of thirteen's email address I believe, that's usually where the 13+ rule comes from. Graal doesn't require an email, unless you're using VIP.