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The Littluns seem to be between five and ten, though it is never specified. I think there is a difference between boys and girls of that age. Boys of that age would not be much different from the boys on that island. I think that, however, girls would treat the Littluns differently. Girls of that age tend to be more inherently maternal.
The Littluns basically spend their time all day playing, eating fruit and relieving themselves. They live in their own world.