The appearance and fusion of these bones helps anthropologists determine the person's age. ... The fourth rib is also used to estimate age as the cartilage between the end of the rib and the sternum slowly turns to bone over time. Finally, it is also possible to use features of the skull to estimate age.
Study the skull of the skeleton. Not only does the size of the skull change as we age, the joints or fontanels between the bones change, becoming smaller with age. If the skeleton has wisdom teeth, the person was past the age of 18. If there is significant bone loss, it indicates a more advanced age.
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