Learning a New Language at Any Age Helps the Brain
Researchers found that young adults proficient in two languages performed better on attention tests and had better concentration than those who spoke only one language, irrespective of whether they had learned that second language during infancy, childhood or their teen years.
In the new study, bilingual young adults performed better in ignoring irrelevant stimuli and focusing on relevant information. One possible reason for this ability is that the very processes of learning two languages and switching back and forth between them train the brain to be more attuned to auditory information, Bak said.
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If I knew 4 languages fluently, I sure as hell would have it on my resume regardless of job qualifications.