Book review - EXTRA LIFE: A Short History of Living Longer
Until a couple of centuries ago, more than a quarter of children died before their first birthday, around half before their fifth. In “Extra Life,” Steven Johnson, a writer of popular books on science and technology, tells the stories behind what he calls, in an understatement, “one of the greatest achievements in the history of our species.”
Steven Johnson: A Short History of Living Longer
Reviewed by Steven Pinker
Starting in the second half of the 19th century, the average life span began to climb rapidly, giving humans not just extra life, but an extra life. In rich countries, life expectancy at birth hit 40 by 1880, 50 by 1900, 60 by 1930, 70 by 1960, and 80 by 2010. The rest of the world is catching up. Global life expectancy in 2019 was 72.6 years, higher than that of any country, rich or poor, in 1950. People in the shortest-lived countries today will, on average, outlive those of your grandparents’ generation.
“Life expectancy” is a statistical abstraction — the average
number of years a newborn would live if prevailing mortality rates remained
unchanged — and much of its rise was propelled by the sparing of children,
whose deaths mix a lot of small numbers into the average. Today, more than 99
percent of children in rich countries survive, and more than 96 percent
worldwide. But it’s not just children: People who clear any obstacles in the
gantlet of life have been granted more time ahead. In 1950, a person who had
reached the age of 70 could look forward to another nine years; today, another
16….
https://www.nytimes.com/2021/05/11/books/review/extra-life-steven-johnson.html