Exercise is strongly associated with improving cognition. As the majority of mortality benefit of exercise is at the highest level of cognition, and declines as cognition declines, the net effect of exercise should be to improve cognition at the population level, even with more people living longer. This information comes from "Changes in Cognition and Mortality in Relation to Exercise in Late Life: A Population Based Study."
Source: PLoS ONE September 3rd, 2008
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