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In page Ellen Bialystok:

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Further work was done with groups of younger and older monolingual and bilingual adults in three consecutive studies investigating the persistence of the bilingual advantage into adulthood, as well as the notion that bilingualism provides a defense against the deterioration that aging brings on executive control. Bialystok, Craik, Klein, and Viswanathan found that results indicated a continuation of the bilingual advantage into adulthood, and a pattern that suggests a slowing of age-related decline in executive processes for older bilingual adults along with other positive effects in cognitive functioning, suggesting widespread benefits of bilingualism beyond what was originally hypothesized.[2]