Light travels faster than sound. This is why some people appear bright until they speak.

Everyone who has ever been a teacher knows that we learn more when we teach than when we are taught.

Why We Should Stop Segregating Children by Age

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We adults flatter ourselves when we think that we are the best models, guides, and teachers for children. Children are much more interested in other children than in us. Children are especially interested in, and ready to learn from, those others who are a little older than themselves, a little farther along in their development, but not too far along. Children are drawn to older children, and older children are drawn to adolescents. Adulthood is too far off to be of much concern. That is why age-mixing is crucial to children’s self-education.

Younger children want to do what older children do.Children on the verge of being able to play strategy games, or read, or perform new operations on the computer, or engage in more advanced athletic activities, become motivated to do so by observing those activities in older children and adolescents. In our study of how and why children learn to read at the school, some told us that they wanted to read because they were envious of the older kids who were reading and talking about what they had read. As one student put it, “I wanted the same magic they had; I wanted to join that club.” Younger children don’t just blindly mimic older ones. Rather, they watch, think about what they see, and incorporate what they learn into their own behavior in ways that make sense to them. Because of this, even the mistakes and unhealthy behaviors of older children can provide positive lessons for younger ones. Young children talk endlessly about what they like and don’t like about the activities of the older ones around them. Negative models can be as helpful as positive ones.

Older children are excellent helpers and advisers of younger children, partly because they do not help or advise too much. Children often prefer to ask an older child rather than an adult for help or advice, even when an adult is available whom they could easily ask. I suspect there are many reasons for this, but one of the main reasons, I think, has to do with control. Children seeking help or advice do not want to give up their own control of the situation. They don’t want any more help than what they ask for, and they want to decide themselves whether or not to accept what is offered. So, here is a valuable lesson that we adults can learn from children about helping and advising children: Don’t give more help, or more advice, than is asked for! Come to think of it, the same lesson applies to helping and advising adults.

Older children expand their own understanding through explanations to younger children. Everyone who has ever been a teacher knows that we learn more when we teach than when we are taught. The requirement to put ideas into words that others can understand, and the need to think through objections that others might make, leads us to think deeply about what we thought we knew. Often this leads us to a better understanding than we had before. In an age-mixed environment, children, not just adults, can learn through teaching.

Older children develop compassion and nurturing skills through helping younger ones. Even more valuable than the cognitive gains derived from interacting with younger children are the moral gains. To develop effectively as responsible, ethical beings, children need to have the experience of caring for others, not just the experience of being cared for by others. 

Psychology Today: Why We Should Stop Segregating Children by Age: Part III - Older Children Are Excellent Models, Helpers, and Teachers by Peter Gray

You’d be in good shape…if you ran as much as your mouth.