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Study: Speaking two languages can keep dementia at bay

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LOS ANGELES — People who spoke two languages developed dementia 4 1/2 years later than those who spoke just one — even in people who were illiterate, said scientists who reviewed the records of hundreds of dementia patients.

The study is the largest to date to document the delay of dementia in bilingual people and the first to suggest that education level alone can’t explain the difference, the researchers said. The researchers also controlled their results for age, sex, occupation…

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