Non-carious extracted teeth from individuals between 40 and 70 years of age were used to study the effect of aging upon the nerves supplying the pulp. Non-carious teeth from young individuals under 20 years of age were used as controls. Ninety percent of the pulps from the old teeth examined exhibited pulpal calcification both diffuse and nodular. In contrast, none of the young pulps showed evidence of calcification. The process of calcification first involved the connective tissue covering ther nerves, and then the nerves themselves. The calcifying process led to the obliteration of the nerves located in the apical portion of the root. There was an apparent decrease in the number of nerve branches in the coronal portion of the old pulp in comparison to the nerve supply to the young pulp.