There is no way to change your age in the game once it has been registered.

You have to register your age the first time you make anin-game purchase. If the register age pop-up does not appear when you attempt to purchase an item, this means that your age has already been registered.

Certain purchase restrictions apply to some ages. More information on age-related restrictions can be found on the following site.

https://www.klab.com/en/safety/

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