GENEVA, July 14 — The numbers tell a story of two worlds. The World Health Organization reports global life expectancy at birth climbed from 66.8 years in 2000 to 73.3 years in 2020. That two-decade gain masks a gap between nations.
Japan leads the world at 84.7 years in 2020. Switzerland follows at 83.4 years.
At the bottom sits Chad, where life expectancy at birth stands at 54.2 years. The gap is driven by factors including healthcare access, nutrition, and infectious diseases, the WHO’s World Health Statistics 2023 report makes clear.
America’s reversal
In the United States, the Centers for Disease Control and Prevention reported life expectancy at birth at 77.0 years in 2020. That figure marks a drop from 78.8 years in 2019 due to COVID-19. The National Center for Health Statistics in the U.S. publishes annual life expectancy data based on death certificates.
The WHO’s World Health Statistics 2023 report also tracks healthy life expectancy, or HALE. Globally, HALE stood at 63.7 years in 2019.
The United Nations projects global life expectancy will reach 77.2 years by 2050. The factors behind the life expectancy gap are driven by healthcare access, nutrition, and infectious diseases. In countries like Japan and Switzerland, universal coverage and advanced medical infrastructure catch disease early and manage chronic conditions over decades.
In Chad, where healthcare spending is among the lowest globally, a treatable infection can become a death sentence. Nutrition plays a parallel role.
Malnutrition weakens immune systems and stunts childhood development, shortening lifespans before adulthood begins. Infectious diseases — malaria, tuberculosis, HIV — concentrate in regions with weak public health systems. The WHO’s data shows these three factors — healthcare, nutrition, infectious disease — account for much of the gap between Japan and Chad.
The United States occupies a middle ground. Its life expectancy of 77.0 years in 2020 places it below most other developed nations, despite spending far more per capita on healthcare. The COVID-19 death toll, concentrated among older adults and those with underlying conditions, exposed vulnerabilities in a fragmented system.
Looking ahead
The National Center for Health Statistics continues to compile annual data. The WHO’s global data offers a longer lens. The rise from 66.8 to 73.3 years over two decades represents real progress.
Vaccination campaigns, improved sanitation, and better maternal care have saved millions of lives. But the persistence of a gap between the top and bottom countries shows how much work remains.
The United Nations projection of 77.2 years by 2050 assumes that progress continues. For now, the numbers stand as a snapshot. Japan’s elderly live into their mid-80s on average.
Children born in Chad today face a life expectancy barely past their 50s. The gap is not inevitable.
The WHO’s data shows it can narrow — but only with sustained investment in the basic building blocks of health. Consult your doctor for medical advice.
