Why 150 Minutes of Exercise Per Week Could Make Your Brain Look Biologically Younger

What if a simple weekly habit could slow how fast your brain ages? New research suggests it might. A year-long clinical trial found that just 150 minutes of aerobic exercise per week, about 20 to 30 minutes a day, was linked to a measurable drop in biological brain age.

Using advanced MRI scans, researchers observed that people who stayed active showed “younger-looking” brains compared with those who did not exercise. The finding hints that regular movement may protect the brain during midlife, a period when subtle aging changes often begin but go unnoticed.

What the Study Found and Why It Matters

The study was led by Dr. Lu Wan and Dr. Kirk I. Erickson at the AdventHealth Research Institute and followed adults aged 26 to 58 for one year. Participants were randomly assigned either to a regular exercise routine, averaging 150 minutes of moderate-to-vigorous aerobic activity each week, or to a control group that did not exercise. Many in the exercise group completed their activity as short daily workouts, making the routine realistic for everyday life.

Researchers measured brain aging using MRI scans and a tool called brain-PAD, which compares a person’s predicted brain age to their actual age. By the end of the study, the exercise group’s brains appeared about 0.6 years younger, while the control group’s brains aged by roughly 0.35 years. That nearly one-year gap emerged even though improvements in fitness, body weight, or blood pressure did not fully explain the change. This suggests exercise may influence the brain through other pathways, such as improved blood flow, reduced inflammation, or subtle structural changes in brain tissue.

Taken together, the results indicate that during midlife, maintaining 150 minutes of aerobic exercise per week may help biologically slow brain aging. If confirmed in broader populations, this habit could play a meaningful role in supporting long-term cognitive health and reducing future dementia risk.

The Real-World Payoff: A Simple, Sustainable Brain-Health Habit

If these results hold, the simplest recommendation becomes clear: aim for 150 minutes of moderate-to-vigorous aerobic activity each week as a practical, biology-backed tool for brain longevity. The era of the ‘device’ is ending; the era of steady, brain-friendly movement is just beginning.

Key Takeaways

• Maintaining 150 minutes per week may biologically slow brain aging
• Brain-PAD changed by ~0.6 years in the exercise group; control rose ~0.35 years
• Mechanisms beyond fitness gains may drive brain aging changes
• Simple movement can complement cognitive health strategies