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During puberty, the bones are growing rapidly. Growth occurs in the long bones in regions at the ends of the bone called the epiphyseal growth plate. The area of bone just beneath the growth plate is not solid bone and is susceptible to damage. Weightlifting could damage the growth plate and result in stunting of bone growth. For this reason, kids should not begin weightlifting until after puberty, when their bones are no longer growing.
There is no evidence that weightlifting with proper supervision is unsafe for kids.
Weightlifting appears to be safe for children with proper supervision.
I received my first weight set when I was 8 years old. It was one of those DP sets that had plastic weights filled with cement. I began then and have continued training for the past 40 years. True to the literature, I did not really begin to experience injuries until I was in my 20s and pushing heavier weight. If you have a son, little brother, or other young family member who wants to start training, the evidence says its OK as long as they are taught proper lifting techniques and are supervised in order to avoid horseplay.