Checking for growth plates in the skull, position of wisdom teeth, bone loss etc can give you a fairly decent idea of how old the bones were when they became no longer live tissue. Apes have known growth/ loss rates for healthy individuals. Poor nutrition, extreme prolonged stress can skew these results, but teeth composition can give you an idea of nutrition condition to rule out variables there. Overall bone composition and environmental data can give you an idea on environmental stressors to rule out variables there.
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