Summary: Despite decades of medical progress, a new analysis finds that gains in human life expectancy have slowed since the 1990s, suggesting a biological ceiling to how long people typically live. The authors argue that continued medical advances are producing diminishing returns for lifespan because the fundamental biology of aging increasingly limits further extension of years lived.
The study calls for a shift in priority from extending lifespan alone to extending healthspan—the number of years lived in good health—and recommends greater investment in geroscience, the study of the biology of aging, as the most promising route to meaningful improvements in healthy longevity.
Key facts
- Average life expectancy in the longest-lived populations rose by only about 6.5 years since 1990.
- The study recommends prioritizing healthspan—healthy, functional years—over pure lifespan extension.
- Research into aging biology (geroscience) is identified as a likely path to safer, more substantive gains in healthy longevity.
Source: University of Illinois
Human life expectancy grew dramatically through the 19th and 20th centuries as improvements in nutrition, sanitation, public health and medical care reduced mortality across ages. But the new analysis led by researchers at the University of Illinois Chicago finds that after those large gains, the pace of improvement has slowed significantly since 1990.
Using demographic data from the eight countries with the longest life expectancies, Hong Kong and the United States for the period 1990–2019, the researchers document a deceleration in life expectancy gains. Even though medical and public health advances continue, improved survival at older ages is increasingly limited by the underlying processes of biological aging.
Lead author S. Jay Olshansky of the UIC School of Public Health notes that many years of life gained in past decades resulted from reducing early- and mid-life mortality from infectious disease and accidents. Those victories produced rapid rises in average life expectancy that are now tapering off, because aging-related deterioration becomes the dominant barrier to further improvements.
The paper, published in Nature Aging and titled “Implausibility of Radical Life Extension in Humans in the 21st Century,” concludes that unless the fundamental biological processes of aging are substantially slowed, dramatic extensions of human lifespan are unlikely within this century. The analysis estimates that survival to age 100 will remain relatively rare—unlikely to exceed roughly 15% for females and 5% for males—unless aging itself can be altered.
Olshansky emphasizes that continuing to focus narrowly on reducing disease without addressing aging could extend life years that are not healthy, creating a larger burden of poor health in advanced age. For that reason, the authors recommend shifting research and policy toward interventions that slow aging and increase healthspan, not just lengthen life.
The study does not argue that no further gains are possible. Rather, it frames current trends as a “glass ceiling”: improvements are possible through reduced risk factors, reduced disparities, healthier lifestyles and especially research into the biology of aging. These strategies can help people live both longer and healthier lives and may eventually push beyond the current ceiling if aging processes are successfully targeted.
The findings also have practical implications for industries and planning assumptions that depend on projections of very long lifespans, such as retirement planning and insurance. The authors caution that policies and products that assume most people will reach age 100 may be based on unrealistic expectations under current biological constraints.
About this aging and longevity research news
Author: Brian Flood
Source: University of Illinois
Contact: Brian Flood – University of Illinois
Image: The image is credited to Neuroscience News
Original research: “Implausibility of radical life extension in humans in the twenty-first century” by S. Jay Olshansky et al., Nature Aging (open access).
Abstract
Implausibility of radical life extension in humans in the twenty-first century
Over the twentieth century, life expectancy at birth rose by roughly 30 years in high-income nations, driven largely by public-health measures and medical advances that reduced mortality at early, middle and older ages. Whether that pattern of accelerated improvement would continue into the twenty-first century has been uncertain.
Using national vital statistics and demographic survivorship metrics for Australia, France, Italy, Japan, South Korea, Spain, Sweden and Switzerland, plus Hong Kong and the United States, for 1990–2019, the authors analyzed recent trends in death rates and life expectancy. They report a deceleration of life-expectancy improvements since 1990, along with increased resistance to further gains, reduced lifespan inequality and mortality compression.
Their results imply that, unless the biological processes of aging can be substantially slowed, radical human life extension is unlikely in this century and survival to age 100 will remain uncommon for most populations. The authors suggest prioritizing geroscience and interventions that extend healthspan as the most promising path forward.