Many industrialized countries are becoming an ageing societies, which holds an increasing number of populations in old age. While this trend is likely to be seen as social drawbacks, there are apparently both pros and cons. A society with a considerate number of elder adults can not only lead to a well-matured democracy but also helps with building multilateral cooperation between nations. For instance, a population with a lot of the old would make a better political decision, which turns our democracy to a right a direction. In addition, since the growing population tend to require the economic expansion of nations, a steady population late would facilitate maintaining the international bond in various global issues. On the other hand, the high ratio of elderly people can cost extra pension, as well as reduce the total income from working age. The fewer working people will reduce the amount of income and make it difficult to economically support the old with a pension many i...