The radiograph of a femur can be analyzed to determine the age of a child by analyzing the rate of ossification in the metaphysis.
Bones, especially large ones such as the femur are divided into three main regions:
In the metaphysis of the bone, there is a region known as the growth plate that is responsible for the growth. In this way, at a young age, the growth plate is opened or slightly separated from the other regions, but once you become an adult it completely ossifies and closes.
These changes can be easily observed in radiographies, in this way, by checking the rate of ossification of the metaphysis or how open or closed it is you can know the age of a child.
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