Comparison of an adult male baboon (left, estimated 9 years old) with an old adult (estimated 17 years old). Note the exteme tooth attrition and loss in the older individual. Both specimens are wild baboons that died at Darajani (see Bramblett,CA 1969. Non-metric skeletal age changes in the Darajani baboon. Am. J. Phys. Anthrop. 30:161-171.).