![]() Recent genetic research suggests that the strain emerged a few years earlier, around 1915, but did not take off until later on. This influenza outbreak wasn’t restricted to Spain and it didn’t even originate there. It summarizes the mortality in a particular year by calculating the average age of death of a hypothetical cohort of people for which that year’s mortality pattern would remain constant throughout their entire lifetimes. Period life expectancy, which is the precise name for this measure, captures the mortality in one particular year. To make sense of the fact life expectancy declined so abruptly, one has to keep in mind what it measures. ![]() Most striking is the large, sudden decline of life expectancy in 1918, caused by an unusually deadly influenza pandemic that became known as the ‘Spanish flu’. ![]() What also stands out is how abrupt and damning negative health events can be. This was not just an achievement across the countries shown here life expectancy has doubled in all regions of the world. The visualization shows that in many countries life expectancy, which measures the average age of death, doubled from around 40 years or less to more than 80 years. In the last 150 years the world has seen an unprecedented improvement in health. Parts of the article - mostly the mortality estimates of the various influenza pandemics - were revised in May 2023. Our World in Data presents the data and research to make progress against the world's largest problems.
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