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Introduction: With the increasing population of elderly people, the risk of diseases and health problems is also increases. One of the most suitable ways to reduce the elderlies' problems during this period is to adopt to a healthy lifestyle. The aim of this study was to determine the lifestyle of the elderly people in Tehran. Materials & Methods: This descriptive study on 400 elderly people of Tehran was conducted through random stratified sampling in 2014. Data was collected by “Healthy Lifestyle Measure in the Iranians Elderly” which include 46 questions. The validity of the questionnaire was measured by eight experts and ten elderlies’ comments and reliability by, alpha Cranach. Data were analyzed by SPSS/19. Findings: The mean score of a healthy lifestyle in elderly people was 62.90 ±9.16 based on the scale provided in the intermediate level. Among those, 35 (8.8 %) have a desirable lifestyle, 342 patients (85.5 %) moderate lifestyle and 23 (5.8%) had undesirable lifestyle. The highest mean score of lifestyle-related care of yourself and the lowest was in the area of sport and physical activity. Conclusion: According to the level of moderate lifestyle of elderly people, the need for administrative and educational measures to enhance the lifestyle of the elderlies to the desired level is suggested.