Probably the most important thing to remember from the top link:
“Even if we cannot compare three months of intensive language study with a lifetime of being bilingual, there is a lot to suggest that learning languages is a good way to keep the brain in shape”, says Johan Mårtensson.
http://www.lunduniversity.lu.se/o.o.i.s?news_item=5928&id=24890
According to Johan Mårtensson from Lund University, if you are learning new language quickly, it helps your brain to become bigger and increase its activity:
And there is more: