The results of this study indicate that quantitative bone histology is a useful method for estimating adult age at death, producing accuracy values comparable to conventional gross morphological methods. Not all histological methods evaluated in this research performed uniformly, indicating that the histological evaluation technique and statistical model utilized are important factors in the amount of objectivity, accuracy, and observer error that is expected or introduced. Histological methods using the femur may be more promising than current gross morphological methods for increasing the accuracy of age estimates in individuals over 50 years of age. This research identifies techniques to reduce observer error and suggests changes that are needed to increase the accuracy of future quantitative histological methods for estimating adult age at death.The estimation of age is one of the most important aspects in the analysis of human remains. Given the variation observed in the morphological pattern of adult skeletal age changes, age can often be the most difficult analysis to perform. Gross morphological methods used to estimate age at death are extensively applied and have been well tested, but histological methods have not been subjected to the same levels of scrutiny. Inadequate testing of histological methods using small or inappropriate samples has led to literature that is confusing, inconsistent and sometimes conflicting in terms of recommended methodology and reported rates of precision and accuracy. A major problem with methods of age estimation is differentiating error levels caused by biological variability from those originating from methodological and/or post-mortem diagenetic factors. Systematically evaluating the value of quantitative histological methods for the estimation of adult age at death will determine their practical application.This research applied quantitative histological methods that analyze cortical bone cross-sections from the ribs and femoral mid-shafts. In all, six histological methods (three relating to the rib and three to the femur) were tested using a known age skeletal sample consisting of 250 individuals (ages 13 to 92) from the crypt of Christ Church, Spitalfields, London a burial site that was in use from 1729 to 1857. Histomorphometric data were collected from 440 undecalcified rib and femur thin-sections.