A study spanning ages 19 to 94 found that brain health consistently improved over three years regardless of age or starting point, using just minutes of daily activity

Cognitive decline with age has been treated as close to a law of nature. Processing speed slows. Memory becomes less reliable. Mental sharpness, the assumption goes, peaks sometime in early adulthood and erodes gradually from there for the rest of a person’s life. This assumption shapes how people in their fifties, sixties, and seventies think about their own minds, often with quiet resignation about changes they assume are permanent and one-directional.

A three-year study published in Scientific Reports, a Nature journal, by researchers at the University of Texas at Dallas’ Center for BrainHealth just tested that assumption directly using data from nearly 4,000 adults ranging from 19 to 94 years old. What they found does not fit the decline narrative. Brain health, measured across multiple dimensions, improved over the three-year period across the entire age range studied, including in participants in their 80s and 90s. The gains came from spending just a few minutes a day on structured brain-training activities.

What participants actually did

The intervention was a curriculum called SMART, Strategic Memory Advanced Reasoning Training, developed at the Center for BrainHealth over more than a decade of prior clinical trials. It is not a brain-game app with flashing puzzles. It teaches specific cognitive strategies, then has participants apply them to their own lives.

One module focuses on strategic attention: learning to filter out irrelevant information and concentrate effort on what actually matters. The practical exercise is simple. Each day, participants identify the two tasks that require the deepest thinking and protect time for those, rather than treating every item on a to-do list as equally demanding.

Another module targets integrated reasoning, the ability to pull out the big-picture point from a pile of information instead of trying to absorb and remember everything. Participants practice extracting the core idea from an article, conversation, or meeting rather than cataloguing details.

A third module works on cognitive flexibility, training people to generate multiple interpretations of the same situation, including deliberately practicing this on divisive or emotionally charged topics where most people default to a single fixed view.

Each module runs about 30 minutes and is delivered through short videos, animations, and interactive exercises on an online platform. Twice a year, participants complete a roughly 90-minute assessment, the BrainHealth Index, which scores them across three areas: Clarity (reasoning, flexibility, processing speed), Connectedness (social engagement and sense of purpose), and Emotional Balance (stress, resilience, sleep, life satisfaction). Between assessments, participants also get quarterly coaching calls to help translate the strategies into daily habits.

The result

Scores on the BrainHealth Index rose over the three-year period, and the improvement showed up across all three categories, not just raw cognitive performance. The gains appeared regardless of age, gender, or education level, and people who started with lower scores improved alongside people who started with higher scores. Participants who engaged with the platform most consistently showed the largest gains, suggesting a dose-response relationship rather than a one-time effect from simply enrolling.

The age range is what makes this notable. Participants in their 80s and 90s, the group for whom decline is most expected and most often treated as irreversible, showed the same upward pattern as everyone else. “For too long, we’ve operated under the outdated notion that we need to wait until something bad happens to our brain before we do anything for it,” said Sandra Bond Chapman, founder of the Center for BrainHealth and the study’s principal investigator.

The caveat worth keeping in mind

Participants opted into an online brain-health program, which means they were likely more motivated and more comfortable with technology than the general population of older adults. The study does not claim this reverses dementia or substitutes for medical care in people experiencing genuine neurological disease.

What it does show is that, within a large and age-diverse group, the assumption that aging brains can only get worse, that the best realistic outcome is a slower decline, did not hold. Improvement, not decline, was the typical pattern, driven by a specific set of attention, reasoning, and flexibility strategies that took about 30 minutes per module to learn and were reinforced through twice-yearly testing and quarterly coaching.

Sources:

Cook, L.G., Spence, J.S., Chang, Z., Venza, E.E., Tate, A., Robertson, I.H., D’Esposito, M., Ling, G.S.F., Wigginton, J.G., Chapman, S.B. Measuring and increasing the brain health span across adulthood: a public health imperative.
Scientific Reports, 2026.
DOI: 10.1038/s41598-026-51403-3