By artificially creating social units in which everyone is the same age, the ability to help and to learn from each other is greatly reduced. Instead, conditions for competition are automatically created, because each child is put under pressure to be just as good as the next one.

In a group of ten children of quite different ages, there will naturally be much more cooperation than in a group of ten ten-year olds.

[Helena Norberg-Hodge]
Ancient Futures: Learning From Ladakh, p.108-9

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Our Karate class is our community. All ages come together and help each other to train and improve.