Life expectancy gains have stalled, study finds; average Brit unlikely to reach 100 without major breakthrough
Analysis of 23 high‑income countries shows century‑long rise has slowed markedly, with per‑generation gains falling since the mid‑20th century
A new analysis of life‑expectancy trends across 23 high‑income countries finds that the steady rises seen during the 20th century have slowed substantially, and that current generations are unlikely to reach an average age of 100 without a major scientific or medical breakthrough.
Researchers reported that, while average life expectancy across the studied countries climbed from about 62 at the start of the 20th century to roughly 80 today, the pace of improvement has decelerated. Between 1900 and 1938, life expectancy increased by about 5.5 months per generation; since then the gain has slowed to roughly 2.5–3.5 months per generation, and the trend is expected to level off rather than accelerate toward centenarian averages.
The study’s authors said the historical leap in longevity represented an "unprecedented" improvement in human survival, driven in large part by public‑health measures and medical advances that reduced infectious disease deaths and improved maternal and child survival. Those gains were largest in the first half of the 20th century, they said, but have not continued at the same rate in later decades.
Because the recent per‑generation increases are smaller, the researchers concluded that, absent substantial new interventions that extend human lifespan, no currently living generation in the surveyed high‑income countries is likely to attain an average lifespan of 100. The study did not identify specific interventions that would change the trajectory, but it framed future centenarian averages as contingent on "major breakthroughs" in human longevity.
The findings add to ongoing discussions among demographers, public‑health officials and policymakers about the future burden on health and social services as populations age. Even with slowing gains in average lifespan, absolute numbers of older people continue to grow in many countries because of past improvements and population cohorts reaching older ages.
The analysis underscores a widening gap between past expectations of continual rapid increases in life expectancy and the more modest, incremental gains observed in recent decades. Researchers said the trend warrants continued monitoring and investment in both prevention and age‑related health research, while noting that the timing and nature of any reversal in the slowdown cannot be predicted from current data.