MOST OF US WILL enjoy wonderfully long lives. For those born in 2000, the average life expectancy at birth was age 80 for men and 84 for women. That’s a vast improvement since 1900, when life expectancy was age 52 for men and 58 for women.
The bad news: While men can now expect to live 28 years longer and women 26 years longer, the bulk of the improvement—20 years—came in the first half of the 20th century.