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Yerm said:
it doesnt but they have to put warnings on it just in case some kid ges epilepsy or damages their eyes from using the 3D for too long. unlikely, but it could happen

It's because focus, tracking and depth perception are still developing during the first 7 years of life. There's a risk that spending hours with the 3D slider turned up could mess with that development, which is why its not recommended for kids under that age, although not all experts agree.