A large-scale study tracking older Americans over more than a decade has overturned a stubborn cultural assumption: that aging inevitably means decline. Instead, researchers found that nearly half of adults 65 and older experienced measurable improvements in thinking, physical ability, or both.
The analysis drew on data from more than 11,000 participants in the Health and Retirement Study, a federally funded long-term survey. Over as long as 12 years of observation, 45% showed improvement in at least one of the two areas the researchers examined. About 32% improved cognitively, while 28% improved physically. For many, the gains were large enough to matter clinically.
The findings challenge what Becca R. Levy, the study's lead author and a professor of social and behavioral sciences at Yale School of Public Health, calls a pervasive misconception. "Many people equate aging with an inevitable and continuous loss of physical and cognitive abilities," Levy said. "What we found is that improvement in later life is not rare, it's common, and it should be included in our understanding of the aging process."
Mental abilities were assessed using a global cognitive test. Physical function relied on walking speed, which geriatricians consider a key health indicator because of its tight link to disability, hospitalization, and death. When researchers counted not just those who improved but also those whose cognitive abilities remained stable, more than half of the study's participants avoided the expected trajectory of mental decline.
The discrepancy between what happens to individuals versus the broader trend is telling. "What's striking is that these gains disappear when you only look at averages," Levy explained. "If you average everyone together, you see decline. But when you look at individual trajectories, you uncover a very different story."
Belief Systems Shape Outcomes
The study went beyond documenting improvement and investigated why some older adults thrived while others followed a different path. The researchers examined whether participants held positive or negative views about aging at the start of the research.
The pattern was clear: older adults with more positive beliefs about aging were significantly more likely to improve in both cognitive performance and walking speed. This relationship held even after the team accounted for age, sex, education, chronic disease, depression, and how long participants were followed.
The connection between belief and biology aligns with Levy's broader research on what she calls stereotype embodiment theory. The theory proposes that age-related stereotypes absorbed from society through media, advertising, and cultural messaging can become personally internalized and produce measurable physical effects. Previous work by Levy found that negative beliefs about aging correlated with poorer memory, slower walking speed, higher cardiovascular risk, and biomarkers linked to Alzheimer's disease. The new study suggests the reverse is also true: positive age beliefs appear linked to actual improvement.
"Our findings suggest there is often a reserve capacity for improvement in later life," Levy said. "And because age beliefs are modifiable, this opens the door to interventions at both the individual and societal level."
The improvements were not confined to people who started with problems. Researchers found that even participants who began the study with normal cognitive and physical function frequently improved over time. This finding undermines the idea that later-life gains simply reflect bouncing back from illness or recovering lost ground.
The authors hope the results will reshape how the public thinks about aging and chip away at the belief that continuous deterioration is written into human biology. They also point to the findings as justification for greater investment in preventive care, rehabilitation programs, and health-promoting services that help older adults build resilience and capacity.
The study was published in Geriatrics and was supported by funding from the National Institute on Aging.
Author Jessica Williams: "This study demolishes the myth that aging is a one-way ticket to decline, which matters because our beliefs about ourselves actually shape our bodies and minds."
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