The Economist discusses the average age of man in a recent article, including the fascinating sum of the years lived by the living - rising both because of more people and their longer lives:
"In 2011 the world's population reached 7 billion, just 13 years after hitting the 6 billion-person milestone. In 2011, the average person was just under 32 years of age, four years older than in 1950, when a mere 2.5 billion souls lived on Earth.
Thanks to improvements in living standards and economic growth, average life expectancy at birth has leaped by 20 years, to 68. In the table below the UN's population projections show a continuation of this recent trend."
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