Dr Norman Swan Says 40s Brain Health Hinges on Mind Wandering and Delaying Retirement
Updated
Updated · The Guardian · Sep 6
Dr Norman Swan Says 40s Brain Health Hinges on Mind Wandering and Delaying Retirement
1 articles · Updated · The Guardian · Sep 6
Summary
Midlife—especially the 40s and 50s—is the key window to protect cognition, Swan said, arguing people should think in terms of cognitive change rather than simple decline.
Fluid intelligence may peak in the 20s, but crystallised intelligence can keep improving with age as the brain builds compensating neural “scaffolding,” particularly in the prefrontal cortex.
Mind wandering and “mental time travel” appear to support that scaffolding, while rumination, depression and alcohol can occupy or damage the same brain systems needed for judgment and memory.
Exercise, an anti-inflammatory diet rich in leafy greens, berries and yoghurt, and better stress responses can strengthen brain plasticity, and Swan said it is never too late to start.
Seven “super-agers” he interviewed suggested lifestyle matters more than genes, and Swan argued retirement to “the couch and Netflix” speeds decline unless replaced by work, volunteering or learning new skills.