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These Will Be the Oldest Populations by 2050

Japan equipped to handle ageing boom, Greece and South Korea aren't
Sen Honda smiles as she crochets at the Kirigaoka Day Home in Kita ward in Tokyo. The city is one of only four cities among the 71 most-populous urban centers ranked by the United Nations that are poised to shrink between 2014 and 2030, and the other three are also in Japan.

Sen Honda smiles as she crochets at the Kirigaoka Day Home in Kita ward in Tokyo. The city is one of only four cities among the 71 most-populous urban centers ranked by the United Nations that are poised to shrink between 2014 and 2030, and the other three are also in Japan.

Photographer: Yuriko Nakao/Bloomberg
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Millennials in Japan, Korea, Greece, Italy, Portugal and Spain beware.

By 2050, you will have entered or joined the ranks of the world's super-ageing economies, where more than 40 percent of the population will likely be over 60, according to the latest United Nations figures. That places a burden on upcoming generations paying for a welfare system strangling economies with sluggish growth and mounting debt.