Over coming decades, changes in population age structure will have profound implications for the macroeconomy, influencing economic growth, generational equity, human capital, saving and investment, and the sustainability of public and private transfer systems. How the future unfolds will depend...

Birth rates are dropping to ever-lower levels around the world. Populations are growing more slowly and, in some cases, beginning to decline. Rapid population aging has begun in the West and parts of Asia and is just over the horizon elsewhere. The demographic changes, their economic...