New Yale Study: Many Older Adults Improve as They Age

A long-term study by Yale University debunks one of the biggest myths about aging. Nearly half of people over 65 showed physical, mental, or both types of improvement over time—despite the widespread assumption that aging means steady decline. The researchers found that people with a more positive attitude toward aging were significantly more likely to show these improvements. The study was published in the journal Geriatrics.

Aging and Improvement Over Time

The study found that many older adults actually improve over time and that their attitude toward aging may play an important role in this. Based on data spanning more than a decade from a large-scale, nationally representative study of older Americans, the researchers found that nearly half of adults aged 65 and older showed measurable improvements in cognitive function, physical function, or both. The findings suggest that improvement in later life is far more common than many people realize.

“Many people equate aging with an inevitable and continuous loss of physical and cognitive abilities,” said Becca R. Levy, lead author of the study and professor of social and behavioral sciences at the Yale School of Public Health (YSPH). “We found that improvement in later life is not rare but widespread and should be incorporated into our understanding of the aging process.”

The research team analyzed data from more than 11,000 participants in the “Health and Retirement Study,” a government-funded long-term study of older Americans. To measure changes in mental abilities, the researchers used a comprehensive cognitive assessment. Physical functioning was assessed based on walking speed—a measure often considered by geriatricians to be a key indicator of overall health, as it is closely linked to disability, hospitalizations, and mortality. The participants were followed for up to 12 years. During this time, 45% showed improvement in at least one of the two areas studied.

About 32% showed cognitive improvement, while 28% showed physical improvement. For many participants, the gains were so substantial that they can be considered clinically significant. When the researchers also included those whose cognitive abilities remained stable rather than deteriorating, more than half of the participants defied the widespread expectation of cognitive decline. “It’s striking that these improvements disappear when you look only at the average values,” said Levy, author of the book Breaking the Age Code: How Your Beliefs About Aging Determine How Long & How Well You Live. “If you average them all together, you see a decline. However, when you look at individual trajectories, a completely different picture emerges. A significant percentage of the older participants we studied have improved.”

The Role of Positive Attitudes Toward Aging

The researchers wanted to know not only whether older people can improve over time, but also why some succeed in doing so while others do not. The focus was on a factor that had long been considered a rather marginal psychological issue: personal attitudes toward aging. At the beginning of the study, participants were asked about their perceptions of aging. The questions centered on fundamental beliefs—such as whether aging is primarily associated with loss, dependence, and illness, or whether later stages of life can still enable development, activity, and quality of life. The results were remarkably clear. Over the course of the study, individuals with more positive views of aging showed significantly more frequent improvements in their cognitive performance and physical functions, particularly walking speed. This correlation remained even after statistically accounting for other influencing factors such as age, gender, educational level, chronic illnesses, or depressive symptoms.

The study thus builds on a research approach that Yale researcher Becca R. Levy has been developing for years: the so-called “Stereotype Embodiment Theory.” This theory posits that societal perceptions of aging are not merely abstract cultural concepts but are internalized by people over the course of their lives. Ideas about what aging means are conveyed from a young age—for example, through advertising, movies, social media, or everyday language. If these messages are repeated over decades, they can become part of a person’s self-image. The researchers see precisely this as a possible biological mechanism. People who consistently associate aging with weakness and decline may unconsciously develop lower expectations of their own capabilities. This can influence behavior, motivation, and even physiological processes. People with more negative perceptions of aging may exercise less, withdraw more from social interactions, or interpret normal age-related changes more quickly as signs of an inevitable decline. Previous studies by Levy suggest that these psychological factors can have measurable physical effects. Negative attitudes toward aging have been linked, among other things, to poorer memory, slower movements, higher stress levels, greater cardiovascular strain, and biomarkers associated with Alzheimer’s disease. Some research even suggests that people with more positive views of aging live longer on average.

The new study now expands on these findings by adding an important aspect: Not only can negative expectations be harmful—positive attitudes may also be actively linked to improvements. According to Levy, this suggests that so-called “reserve capacities” are often still present even in older age. This refers to the ability of the body and brain to adapt, regenerate, and stabilize or even enhance performance. However, the researchers caution against a simplistic interpretation. Positive attitudes alone do not prevent either disease or biological aging. Rather, the interplay between psychological factors, behavior, social environment, and physical health is crucial. People who view old age as an active phase of life may be more likely to remain physically active, engage in social interactions more frequently, pay closer attention to their health, and make more consistent use of medical services. The findings thus also raise societal questions. In many Western cultures, a negative image of old age continues to dominate. Youth is often regarded as the ideal, while old age is primarily portrayed as a time of loss. According to the researchers, such societal narratives could have real health consequences.

Questioning Prejudices About Aging

The observed improvements were not limited to older adults with health limitations. Even participants who already had normal or stable physical and cognitive functions at the start of the study frequently showed further progress over the years. The results thus contradict a widespread assumption about aging: the notion that improvements in later life merely represent recovery from illness or the compensation for temporary deficits. Rather, the data suggest that the human brain and body can retain significant potential for adaptation and development even in old age. In aging research, there is increasing discussion of “plasticity”—that is, the ability of biological systems to adapt to new demands, stabilize functions, or even develop new abilities. Neuroscience, in particular, has shown in recent years that the brain is not static, even in old age. Neurons can form new connections, cognitive strategies can be trained, and physical activity can promote processes that were long attributed exclusively to younger people.

Physically as well, old age is now seen much less as a rigid downward trajectory than was previously assumed. Studies show that targeted strength training, exercise, social activity, and rehabilitation can still lead to significant improvements in mobility, muscle strength, and independence, even in very old people. The Yale researchers therefore view their findings as evidence that many older adults possess so-called “hidden reserve capacities” that are often underestimated. At the same time, the findings highlight how strongly societal perceptions of aging can influence scientific and medical views. In many Western societies, old age is still predominantly associated with loss, the need for care, and mental decline. This perspective shapes not only public debates but, to some extent, health policy priorities as well. When aging is viewed primarily as a phase of inevitable decline, opportunities to promote development and stabilization are easily pushed into the background.

The authors therefore hope that their findings will help foster a more nuanced public perception of aging. Aging does not necessarily entail a linear decline but rather proceeds in an individualized and dynamic manner. Despite health challenges, many people experience phases of stability, adaptation, or even improvement. From the researchers’ perspective, this also has practical implications for health care systems and social policy. If older adults can in fact benefit more frequently from preventive measures and targeted support programs than previously assumed, this argues for greater investment in areas such as rehabilitation, prevention, exercise programs, cognitive training, and social participation.

Early promotion of resilience in older age appears particularly important in this context. Factors such as physical activity, social integration, lifelong learning, and mental health could help maintain existing reserves for longer or reactivate them. The study thus supports a shift in perspective in geriatric medicine: away from a purely deficit-oriented view toward a model that places greater emphasis on potential, adaptability, and quality of life. Ultimately, the study raises not only medical questions but also cultural ones. It calls for a rethinking of societal notions about what aging actually means—and what opportunities remain open to people even in later stages of life.