The pace at which human life expectancy is increasing appears to be slowing down, according to a recent study. While there have been significant improvements in life expectancy over the past two centuries, driven by factors such as better nutrition and advances in healthcare, researchers have observed a significant slowdown in the rate of increase over the last thirty years.
The University of Illinois Chicago School of Public Health led the study, suggesting that rather than focusing solely on extending lifespan, efforts should be redirected towards improving the quality of life in older age. Lead author S Jay Olshansky emphasised the importance of increasing the number of healthy years lived, rather than simply extending lifespan through medical interventions.
Olshansky highlighted that many individuals today are living longer due to medical interventions, but these additional years are not necessarily spent in good health. The study indicated that unless significant progress is made in slowing down the biological ageing process, achieving radical life extension, such as living to 100 years and beyond, may be unrealistic in this century.
The research, published in Nature Ageing, analysed data from regions with the highest life expectancies globally – including Hong Kong, Japan, and Australia – comparing trends from 1990 to 2019. The findings revealed that life expectancy gains have been slowing across the world, with the United States experiencing a notable decline in the rate of increase.
Despite advancements in medicine and public health, the study reported that life expectancy for individuals in the longest-living populations has only increased by an average of six and a half years since 1990. This falls short of earlier expectations that life expectancy would continue to rise at an accelerated pace, with many people expected to live beyond the age of 100.
The implications of these findings are significant for social, health, and economic policies moving forward. Researchers suggest that as more individuals are exposed to the challenges of ageing, the rate of life expectancy gains is likely to continue to slow. The study advocates for a shift towards interventions that target the ageing process itself, with the aim of extending the number of healthy years lived by individuals.