"These findings are of considerable practical relevance. Millions of people around the world acquire their second language later in life. Our study shows that bilingualism, even when acquired in adulthood, may benefit the aging brain."
But he admitted that the study also raised many questions, such as whether learning more than one language could also have the same positive effect on cognitive ageing and whether actively speaking a second language is better than just knowing how to speak it.
Dr. Alvaro Pascual-Leone, professor of medicine at Harvard Medical School in Boston, US, said: "The epidemiological study provides an important first step in understanding the impact of learning a second language and the ageing brain.
"This research paves the way for future causal studies of bilingualism and cognitive decline prevention."
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