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While there is a growing body of research on second language acquisition in children and prime-of-life learners, much remains to be explored about how older adults learn a new language and how good additional language learning is for them (see e.g. Mackey and (2) age-related social, psychological and contextual factors seem to play as significant a role as strictly maturational factors. Such research promises in due course to inform adult educators about the establishment of relevant third-age learner profiles as well as the design of individualized third-age language training.
Pfenninger et al. (Fri,) studied this question.
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