Between 1900 and 2000, average life expectancy increased by nearly 30 years in the United States and most other developed countries of the world, and the developing world is catching up quickly. For the first time in history, most people now being born can expect to live seven, eight, nine, or more decades. This achievement changes not only the trajectory of individual lives but also the shape of societies: Adults 60 and older are now the fastest-growing segment of our population.
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