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Re:Woman Rides Bicycle to 183.9 MPH, a New World Record by TheSpiceIsLife on Tuesday September 18, 2018 @10:35PM (#18021219)
Also, as far as I understand, growing bones impart a bit more flexiblity to the skeleton due to epiphyseal plates at either end of long bones.

Or is this a myth?

Re:Woman Rides Bicycle to 183.9 MPH, a New World Record by MaxfordAndSons on Wednesday September 19, 2018 @02:44AM (#18022237)
I believe that's true, but I doubt it's really a factor in this phenomenon of kids surviving high speed crashes that would likely be fatal to adults. It's really just a matter of a less massive body generating (exponentially) less force on impact.