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We have all seen the numbers before: Over the coming decades, many countries in the developed and developing world alike will significantly age. One particular number to describe this development is the “old-age dependency ratio.” It measures the number of those aged above 65 years (currently defined as old age) as a share of those between 15 to 64 years (currently defined as working age). In other words, this ratio tells us how many retired people a potential worker has to sustain. With global aging, it will deteriorate dramatically in most countries over the coming decades. This raises serious concerns about the sustainability of pension systems.