Japan is one of the fastest ageing countries in the world, in 1950 there were 9.3 people under 20 for every person over 65. By 2025 this ratio is forecast to be 0.59 people under 20 for every person older than 65. Population ageing is constituted by a shift in the distribution of a country's population towards greater ages. Thus an increase in the population's mean or median age, a decline in the fraction of the population composed of children, or a rise in the fraction of the population that is elderly are all aspects of population ageing.
(source: Wikipedia)
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