The present study was designed to investigate the incidence and immunohistochemical characteristics of pitu- itary tumors in the elderly. In our surgical collection of 1925 cases, we examined tumor tissue from 15 patients over 80 years of age. Pituitaries obtained at routine au- topsies from 692 subjects over 80 years of age were also investigated. Of the 15 surgical cases studied, the majority of patients presented with chiasmatic syn- dromes, likely caused by macroadenomas. Gonado- troph adenomas were the most frequently diagnosed tumor type, followed by null-cell adenomas and onco- cytomas. There is only one case with GH cell adenoma. Among 692 autopsy cases, 79 (11.4%) pituitaries were found to contain adenomas in the anterior lobe. In one pituitary, two separate adenomas were detected, hence the number of adenomas in our material was 80. All au- topsy cases were microadenomas except one. The mean diameter of adenomas was 2.2 mm. ACTH cell adeno- mas were the most frequently diagnosed tumor type, followed by PRL cell adenomas and null cell adenomas. The occurrence of pituitary adenomas discovered after routine autopsy in the elderly was common, although these tumors were not found frequently in surgical cases over 80 years of age. Our immunohistochemical study revealed that many tumors contained one or more than one anterior pituitary hormone, although almost all pituitary adenomas were considered to be clinically in- active in surgical and autopsy cases.