In developed nations, an increasing proportion of senior citizens in their population has been observed. This phenomenon is known as ageing population which poses significant challenges to their economy. While the working population does not experience growth in the same ratio with the working population, the burden of supporting larger number of elderly people lies on the smaller number of working people. In other words, government's expenditure on supporting elderly population including social security and medical care, takes up a sizable proportion of country's GDP. This affects the nation's expenditure on other sectors such as education, infrastructure development, and the like. However, whether ageing population is really a bad thing or not requires careful examination.