The onset of many forms of dementia can be delayed by knowing more than one language, according to a study in the journal Neurology. Researchers studied about 650 patients, half of whom spoke at least two languages. The study found that the multilingual group's symptoms started an average of 4.5 years later than those of the single-language group and that the effect appears in three types of dementia: Alzheimer's, frontotemporal and vascular. The findings back up earlier Canadian studies that found multilingualism staved off Alzheimer's symptoms.

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