Since the number of geriatric clinics in our country is inadequate, Chest physicians play a very important role in diagnosis, follow-up and treatment of that group of patients in many centers. In this study, 90 years and older geriatric patients hospitalized in pulmonology services was investigated regarding course of disease. Ninety years and older geriatric patients hospitalized in Pulmonology Department of Duzce University and Duzce Ataturk State Hospital was retrospectively analyzed during three-year period between January 2010 and December 2012. Thirty (57.7%) out of 52 patients was women. The mean age was 93.3 ± 3.9. The most common cause of admission was pneumonia (65.4%). Hypertension was the most common concomitant disease (51.6%). Diabetes mellitus, congestive heart failure was other most common concomitant disease, respectively. 80.8% of all patients was accompanied by at least one concomitant disease. All patients had a mortality rate of 17.3%. The most common cause of admission and concomitant disease in 90 years and older geriatric patients was pneumonia and hypertension respectively. Most of the patients discharged from hospital. Further examination and treatment in patients over the age of 90 should be implemented.