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What bone is used most easily to determine the age of children?

While DNA is the most definitive, a simple X-ray of a child's hand and wrist is the most commonly used, non-invasive method for determining biological or skeletal age, which may differ from chronological age. So, what bone is used most easily to determine the age of children? It's not a single bone, but the collective development of multiple bones in the hand and wrist.