The dominant narrative about aging is one of inevitable decline: bodies break down, minds slow, and the best we can hope for is a graceful fade. A new 12-year Yale study turns that story on its head.
Published in Geriatrics, the study of 11,314 adults aged 50 and older found that 45.15% of participants improved in either cognitive function or walking speed over an average of eight years of follow-up. More than half, 51.06%, maintained stable or improved cognition, and 37.56% did the same for walking speed.
“What we found is that improvement in later life is not rare, it’s common,” says Becca R. Levy, professor at the Yale School of Public Health and lead author of the study. “And it should be included in our understanding of the aging process.”
The researchers analyzed data from the Health and Retirement Study (HRS), a nationally representative longitudinal panel funded by the National Institute on Aging.
- Cognition was assessed using the Telephone Interview for Cognitive Status (TICS), a 27-point battery testing memory, calculation, and recall. The cognition sample included 11,314 participants aged 50,99 (mean 68.1), followed for an average of 8.04 years.
- Walking speed was measured by timing participants over 2.5 meters at a normal pace. The walking speed sample included 4,638 participants aged 65,99 (mean 74.0), followed for 8.54 years.
Participants were classified as improved, stable, or declined using a reliable change index (RCI), a statistical method that accounts for measurement error and practice effects.
The specific numbers
- 31.88% improved in cognition
- 28.00% improved in walking speed
- 45.15% improved in at least one of the two domains
What predicts improvement
The study’s most striking finding was about age beliefs, how people think about getting older. Participants completed a 5-item scale assessing their attitudes toward aging (score range 5,30). Those with more positive age beliefs at baseline were significantly more likely to show improvement:
- Cognition: OR = 1.04 (p = 0.049)
- Walking speed: OR = 1.09 (p = 0.018)
These effects held after adjusting for 14 covariates including baseline age, sex, education, race/ethnicity, depressive symptoms, chronic conditions (CVD, diabetes, hypertension), APOE4 genotype, social isolation, and sleep problems.
“A person’s mindset about aging is not just a passive reflection of their health, it appears to be an active contributor to their trajectory,” Levy explains.
Why it matters
The findings challenge what Levy calls “the myth of universal decline”, the assumption that aging is synonymous with deterioration. If nearly half of older adults are improving or stable in key functional domains, then the framing of aging as a medical problem to be managed rather than a phase of life with potential for growth needs re-examination.
The study does not identify the biological mechanisms behind improvement. Levy speculates that positive age beliefs may reduce stress-related inflammation, encourage health-promoting behaviors, or enhance neural plasticity, but these pathways were not tested.
The limits
The study is observational, it cannot establish that positive age beliefs cause improvement, only that they are associated with it. Residual confounding is possible.
The walking speed sample was older (65+ only) than the cognition sample (50+), limiting direct comparison between domains. The HRS cohort is also predominantly White (81,88%), and the results need replication in more diverse populations.
Improvement thresholds depend on the choice of RCI cut-points, though sensitivity analyses supported the main findings.
Source
Levy BR, Slade MD. “Aging Redefined: Cognitive and Physical Improvement with Positive Age Beliefs.” Geriatrics, 11(2), 28 (2026). DOI: 10.3390/geriatrics11020028
Funding: National Institute on Aging. Data from the Health and Retirement Study (HRS), University of Michigan.