The articles linked below list a number of recent peer-reviewed references making the case for lifelong cognitive benefits from learning a second natural language, ranging from early developmental benefits through to delaying the onset of dementia and Alzheimer's disease.
Might those of us stronger in the formal language of mathematics be gaining comparable benefits?
Or not?
http://dana.org/Cerebrum/2012/The_Cognitive_Benefits_of_Being_Bilingual/
https://en.wikipedia.org/wiki/Cognitive_advantages_of_bilingualism