Population aging is the global phenomenon irrespective of level of development of the country. But, there is dearth of research focusing different issues of elderly in Nepal. This paper discusses aging trends and some aging issues of Nepal focusing the social security in the changing social context of Nepal. For the purpose of this paper research article found through google search and freely available to download or paper author has access is used. Population aging is directly related with the fertility and mortality of the country. Latest trend shows both fertility and mortality are decreasing and average life expectancy as well as proportion of older population is increasing in Nepal. Statistics shows elderly population proportion is increasing and expected to reach 10% of total population in the 2021 census. Aging has resulted problems on social-cultural, economic, demographic, labour, health and care of the elderly. The social security of the elderly is major concern with aging population. But the government has not given adequate priority to the issues of elderly and their social security as well. Government needs to identify the issues of elderly and need to develop sustainable policies for the quality-of-life increasing aging populations.