How long will we live — and how well?

A new analysis looks not only at the number of years we can expect to live, but also at the number of years we can expect to live in good health. In most of the world, life expectancy is longer than it was 20 years ago, but often a smaller percentage of those years will be healthy ones. Read related article.

NOTE: Researchers determined "healthy life expectancy" by estimating the frequency of 1,160 different health problems, weighting each by its relative severity, and subtracting people's time spent with these conditions from overall life expectancy. For example, if a person spent his final year of life with a condition that left him half as healthy as a person with no health problems, six months were subtracted. More than 30,000 people were surveyed to determine the severity weights.

SOURCES: "Healthy life expectancy for 187 countries, 1990–2010: a systematic analysis for the Global Burden Disease Study 2010" by Joshua A. Salomon, et al., Institute for Health Metrics and Evaluation.

GRAPHIC: Bonnie Berkowitz, Emily Chow and Todd Lindeman - The Washington Post. Published Dec. 13, 2012.