World population not only grows, but grows old

On this crowded, hot, trampled planet, one of the most vexing trends is something countless numbers of us see when we look in the mirror: We’re going gray.

The United Nations has declared that the human population will hit 7 billion Monday, and an expanding percentage of those people are in the market for reading glasses.

The aging of the human race has been faster than anyone could have imagined a few decades ago. Fertility rates have plunged globally; simultaneously, life spans have increased. The result is a re-contoured age graph: The pyramid, once with a tiny number of old folks at the peak and a broad foundation of children, is inverting. In wealthy countries, the graph already has a pronounced middle-age spread.

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