Brains in their early 20s might indicate how sharp and dementia-prone they will be late in life: "What looks like an effect of intellectual activities could really be due to differences in the people who choose to engage more in those activities."

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Brains in their early 20s might indicate how sharp and dementia-prone they will be late in life: "What looks like an effect of intellectual activities could really be due to differences in the people who choose to engage more in those activities."