Life expectancy has more than doubled since 1900: what the data says and what it does not

**Research review** ## The hook "People used to die young; now we live twice as long." It is a persuasive line. Let us check what the data says, and what it leaves out. ## In brief - Global average life expectancy was about 32 years in 1900 and 73.2 years in 2023, a gain of 41 years [S-001]. - At the start of the 19th century, demographers estimate that no country had an average life expectancy above 40 years [S-002]. - The gain reflects better living standards, nutrition, sanitation, antibiotics and vaccines. Falling child mortality was crucial but not the only cause: life expectancy rose at all ages [S-001, S-002]. ## What "average" means here This is average life expectancy at birth. It is very sensitive to child deaths: when many children die in their first years, the average drops sharply. So a rise from 32 to 73 years describes how the risk of death changed across all ages together. It does not mean that any one person now lives twice as long. ## The inequality the average hides The global average conceals large differences between countries. In 1950, life expectancy was 72 years in Norway and 26 years in Mali. Africa as a whole averaged about 36 years, while other world regions could expect to live more than twice as long [S-002]. The progress was uneven: the regions that were worst off in 1950 made the biggest gains afterwards [S-002]. ## What is known, what is not, and the risks **Known:** global average life expectancy rose from 32 years (1900) to 73.2 years (2023) [S-001]. Falling child mortality mattered, but was not the only factor [S-001, S-002]. The rise happened at all ages [S-001, S-002]. **Not known:** the exact global figure for 1800. Estimates for that period carry wide uncertainty, and the OWID article gives only "less than 30 years" [S-002]. The sources do not separate out how much each factor (nutrition, sanitation, antibiotics, vaccines) contributed. **Not supported by the sources:** that people were "healthier" or "lived more ecologically" in the past. Life expectancy data does not show that; a low average then is explained by high child mortality and poverty. Nor do the sources show that any supplement, food or practice gives the same gain today. **Risks of reading the data:** an average cannot be applied to an individual. Comparisons across eras depend heavily on the quality of old estimates. ## What next If life expectancy is a personal question for you, discuss it with a doctor. This article does not offer advice on lifestyle, diet or supplements. ## Question for readers Which age do you consider a realistic target for a long life today, and why? ## What was verified and what was meant | Claim | Status | Source | |---|---|---| | Global average life expectancy about 32 years in 1900 | verified against the OWID article (OWID cites UN WPP and HMD) | S-001 | | 73.2 years in 2023, a gain of 41 years | verified against the OWID article | S-001 | | No country averaged above 40 years at the start of the 19th century | verified against the OWID article; country-level estimates are imprecise | S-002 | | 29 years globally in 1800 (figure from the original post) | not confirmed: the available OWID article says "less than 30 years" | S-002 | | Falling child mortality mattered but was not the only cause; gains at all ages | verified against OWID articles | S-001, S-002 | | Causes: living standards, nutrition, sanitation, antibiotics, vaccines | verified as OWID's explanation; the contribution of each factor is not measured in the source | S-001, S-002 | | Norway 72 years and Mali 26 years in 1950 | verified against the OWID article | S-002 | | 1800 estimates from Riley (2005) | DOI metadata checked; article content not opened | S-003 | | "People were healthier and lived more ecologically in the past" | not supported by life expectancy data; opinion from the original post | — | | Photos of Ukrainians aged 35–38 and 42, late 19th century | not verified; removed from the article | — | | Children were not given names until age two | not verified; removed | — | | WHO figures on fertility treatment and preterm care (85–90%, 50–80%, 90%) | WHO source not opened; removed (open request) | — | | Author's personal experience | none provided; no personal block added | — | Author: Serge Luboff. Reviewer: not assigned. Medical review: not performed. This material is not medical advice and does not replace consultation with a doctor.