At what age should a child be allowed to play computer games?

My child learned what computer games are at the age of three. At first, we only allowed educational games. Now my son is 6 years old, I allow him to play games at his own discretion, but I also listen to his interests. Most of all the child likes the game Kung Fu Panda 3: The Furious Fight https://www.manamonster.com/games/11500-kung-fu-panda-3-the-furious-fight

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