A new analysis following adults for decades suggests that increasing physical activity in midlife or later can meaningfully reduce the risk of dementia. People who reached higher activity levels between ages 45 and 64 had about a 40% lower chance of developing dementia later on. Even adults who became more active later in life saw a 36% to 45% lower risk. The findings show that it’s never too late for the brain to benefit from movement.
Researchers found that physical activity affects several pathways linked to cognitive decline, including inflammation, blood vessel health and the buildup of toxic proteins. Regular movement improves circulation, stabilizes blood sugar, supports metabolic health and promotes better sleep — all of which help protect the brain. Even modest activity may build “cognitive reserve,” helping the brain stay resilient as it ages. Importantly, late-life activity offered protection regardless of genetic risk.
While the study relied on self-reported activity and didn’t identify an ideal exercise type, the takeaway is clear: consistent movement supports long-term brain health. Strength training, brisk walking and even light daily movement can help. For many adults, raising activity levels in midlife or beyond may be one of the most practical and effective ways to lower dementia risk.
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