Skeletal age at death: an evaluation of the miles method of ageing

The accuracy of Miles' method of ageing individuals within a population, based upon an analysis of the rate of dental wear, was evaluated in a sample of 202 living Lengua Indians from the Chaco area of Paraguay. The preliterate and culturally isolated status of the Lengua provided a useful base for comparison with populations that are likely to be encountered by archaeologists. The independent age estimates from maxillae and mandibles of the same individuals were found to be highly correlated with each other and to the actual ages of those individuals (Spearman rank-correlation test maxillae r_s = 0·58, mandibles r_s = 0·95, medians of populations rank-sum R = 99·5 > 95). No significant differences (P > 0·05) were found between the mean ages of any of the Miles subgroups, as indicated by the t-test for paired comparisons. The present study provides evidence of the reliability of the Miles method of ageing archaeological populations on the basis of occlusal wear. These findings are evaluated in the light of the sources of error inherent in the Miles system of analysis.