A March 2020 study by Columbia University in New York said,
“[These results] suggest that people may potentially prevent brain shrinking and the effects of aging on the brain simply by becoming more active,"
"Recent studies have shown that as people age, physical activity may reduce the risk of cognitive decline and dementia. Our study used brain scans to measure the brain volumes of a diverse group of people and found that those who engaged in the top third highest level of physical activity had a brain volume the equivalent of four years younger in brain aging than people who were at the bottom third activity level."
"Our results add to the evidence that more physical activity is linked to larger brain volume in older people."
"It also builds on evidence that moving your body more often throughout one's life may protect against loss of brain volume."