• Adults who exercised 150 minutes weekly for 12 months showed brains that appeared seven months younger on structural scans
• Scientists can’t explain why it worked. Despite measuring fitness levels, body composition, blood pressure, and brain proteins, none of these factors accounted for the brain age changes, leaving the mechanism a mystery.
• Before any exercise began, people with better cardiovascular fitness already had younger-looking brains, nearly two years younger for each meaningful fitness improvement.
• Your 30s, 40s, and 50s represent a critical window when exercise might protect against dementia risk decades later, and this study shows moderate activity levels are enough to make a difference.

https://studyfinds.org/aerobic-exercise-brain-younger/