The Slowing Pace of Longevity: Why Today’s Generations May Not Reach 100 Years

Introduction: A Century of Rapid Longevity Gains

At the dawn of the 20th century, human life expectancy was marked by striking advancements. People born in 1900 could expect to live, on average, around 62 years. Fast forward merely 38 years to 1938, and average life expectancy jumped to approximately 80 years. Based on such gains, it was widely hoped that those born in 1980 might enjoy lives extending to 100 years or more.

This optimistic narrative stemmed from remarkable progress in medicine, sanitation, nutrition, and public health during the first half of the 20th century. Infectious diseases, once devastating communities, became largely controllable. Infant and child mortality plummeted, contributing enormously to increasing average lifespan.