A crossing guard in 1938, when kids, not adults, shepherded students across the street.

4-Year-Olds Are Ready for the World!

You might not be ready to let your 4-year-old go out and meet the world, but developmentally, they’re ready to do just that, writes Let Grow co-founder Peter Gray, here. In earlier eras, they started crossing the street at that age, and playing outside with their friends. It’s not ancient history!

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