The number of years someone can expect to live varies more by geography than almost any other health statistic. A child born today in Monaco can expect to live roughly 30 years longer than a child born in Nigeria — a gap that says less about individual biology and more about healthcare access, income, and public health infrastructure.
The global picture
According to the United Nations World Population Prospects 2024 revision, global life expectancy at birth stood at 73.3 years in 2024, having recovered from the temporary decline caused by the COVID-19 pandemic. Broken down by sex, global figures place women at just above 76 years and men at roughly 71 — a gap of about 5 years that holds true across nearly every country and income level, largely attributed to a mix of biological factors and behavioral risk differences such as smoking, alcohol use, and injury rates.
Where life expectancy is highest
Small, wealthy nations with universal healthcare dominate the top of the rankings. Monaco leads globally at roughly 86.5 years, followed closely by San Marino (85.8) and Hong Kong (85.6). These top-ranked places share a common profile: universal healthcare coverage, high GDP per capita, and very low infant mortality — the combination that consistently pushes life expectancy into the mid-80s.
Where life expectancy is lowest
The lowest figures are concentrated in African nations facing ongoing development challenges. Nigeria sits at approximately 54.6 years, with Chad (55.2) and the Central African Republic (57.7) close behind. Political instability, food insecurity, and limited healthcare access are the primary drivers behind these numbers — not genetics or geography in any direct sense.
A surprising finding: spending doesn’t guarantee results
One of the more counterintuitive patterns in the data involves the United States, which ranks around 46th-62nd globally (estimates vary slightly by source and year) despite having some of the highest per-capita health spending in the world. By contrast, countries like South Korea, Spain, and Japan achieve very high life expectancy — Japan sits at roughly 84.8 years — while spending substantially less per person. This suggests healthcare spending alone doesn’t determine outcomes; how a healthcare system is structured and how equitably care is distributed matter just as much.
Why life expectancy has risen so dramatically over the past century
Global life expectancy has climbed steadily since the early 1900s, when high infant mortality and widespread infectious disease kept average lifespans far shorter. The mid-20th century marked the real turning point, with vaccines, antibiotics, and organized public health measures driving substantial, sustained gains — a trend occasionally interrupted by wars, pandemics, and economic crises, but never reversed for long.
What this means for you personally
Life expectancy statistics describe population averages, not individual predictions — they’re influenced heavily by where you’re born and live, but individual factors (genetics, lifestyle, healthcare access, and — as covered in our biological age article — how fast your body is actually aging at the cellular level) matter enormously within any single country’s average. A national life expectancy number is a useful macro indicator of a country’s health system, not a personal forecast.
Sources: United Nations World Population Prospects (2024 revision); World Bank life expectancy estimates; OECD Health at a Glance 2025.