Nearly half of older adults improve physically or cognitively over time

The story we tell about aging is wrong

We have a narrative about getting older: decline is inevitable, loss is gradual, and by 65 you're mostly managing what you've already lost. A decade-long study of over 11,000 Americans just demolished that story. Nearly half of adults age 65 and older actually got better—measurably better—at either thinking or moving or both.

This isn't a feel-good outlier. According to researchers at Yale University led by Becca R. Levy, improvement in later life isn't rare. It's common. And it's been hiding in plain sight because we've been looking at the wrong thing.

Why averages lie

When researchers tracked participants in the Health and Retirement Study over up to 12 years, they measured two things geriatricians care about most: cognitive performance (mental sharpness) and walking speed (a marker of physical resilience that predicts hospitalization risk and longevity). Forty-five percent showed gains in at least one area. About 32 percent improved cognitively. Twenty-eight percent got physically stronger. Many of these improvements were big enough to matter clinically—not marginal noise.

Here's the trick: if you average all the data together, you see decline. That's why the story we've inherited is so persistent. But individual lives don't follow averages. When Levy and her team looked at actual people's trajectories, a different pattern emerged. More than half of the group didn't decline cognitively at all—they either stayed stable or improved.

"What's striking is that these gains disappear when you only look at averages," Levy said. "If you average everyone together, you see decline. But when you look at individual trajectories, you uncover a very different story."

Your beliefs might be shaping your biology

The research uncovered something unexpected: people who started the study with more optimistic views about aging were significantly more likely to improve in both cognitive and physical measures. This held true even after controlling for age, education, chronic illness, depression, and how long they were followed. Pessimism didn't predict decline—it predicted stagnation. But optimism predicted growth.

This connects to what Levy calls "stereotype embodiment theory"—the idea that cultural messages about aging (the jokes, the ads, the low expectations) get internalized and eventually influence our biology. Earlier research from her lab showed that negative age beliefs correlate with worse memory, slower walking, higher cardiovascular risk, and biological markers linked to Alzheimer's. The flip side is what the new data suggests: positive beliefs about aging may actively enable improvement.

What's particularly striking is that these improvements weren't limited to people recovering from illness. Even participants who started with normal cognitive or physical function improved during the study period. This challenges the assumption that gains only happen when you're bouncing back from something. Some people just got better at being alive.

The implications ripple outward. If age beliefs are modifiable—if what you believe about your own aging can be changed—then interventions become possible. Not just individual therapy or mindset coaching, but societal shifts in how we talk about and support older adults. Policymakers could expand preventive care, rehabilitation programs, and other infrastructure designed to enable resilience rather than manage decline.

We've spent decades building a story where aging is a one-way street downhill. The data suggests the road is more complicated. For millions of people, the best years aren't behind them. They're happening now.