Abstract: Objectives: The aim of this study is to analyze the clinical features, laboratory findings and type of treatments in late onset SLE (after 50 years) in Iranian patients and compare them with the early onset. Methods: Records of 1419 SLE patients who attended our lupus unit, between 1975 and 1999 were reviewed. Nineteen Patients with late onset disease were identified. For comparison, 47 patients with disease onset before the age of ...