Abstract: The present strives to investigate the issues relating to population aging in Bangladesh and the global trend of elderly population 60+ as well as discusses the share of less developed countries. The study also presents the trend of elderly population in the selected Asian countries and addresses the basic issues of threshold of old age, measurement of the rate of aging and the oldness of the old. The projected figure of elderly population in Bangladesh shows that the size of the elderly population is expected to increase from nearly 7.51 million in 2001 to 9.39 million in 2011. It is also evident that there is a consistent increase in the proportion of the aged 60+ compared to the population in those of young and adult groups. Thus the older population of Bangladesh is going to increase remarkably during the next four decades 2021 to 2051.