“Health ageing is the development and maintenance of optimal physical, mental and social well being. In the last three decades, the elder population has grow twice as fast the rest of the population. In India 3.8% of the population comprise people above 65 years of age. It is expected that by 2030. elderly population will from 21.8% of the total population of the India. According to the latest census there were 65% of those who come to hospital seeking treatment are above 65 Years of age. The objectives of the study were to assess the knowledge on health promotion behavior among geriatric people, to associate the level of knowledge on health promotion behavior among geriatric people with their selected demographic variables. Descriptive Research design was used for the study. The study was conducted among geriatric people > 60 years in Besant Nagar, Chennai. 50 geriatric people were selected based on the convenient sampling techniques. The data was collected from the geriatric people. The result showed that out of 50 samples 7 (14%) had inadequate knowledge, 41 (82%) had moderately adequate knowledge and 2 (4%) adequate knowledge. The study revealed that the majority of the geriatric people have moderately adequate knowledge. So, the geriatric people need education regarding health promotion behaviour.