From what I know learning languages is good for your brain because it enhances some connections or something (but it is one of the tasks that is hard to maintain and gets difficult with age).

Can you think of a field you are interested in and can learn something more about? Don't know how much time you have on your hands. It can be hard to find time for philosophy or computers when one is uberbusy with other things. I think keeping brain busy with meaninful activity can help a lot. ANd it would be more entertaiming than brain games (and include other areas of thinking and cognition). The key is to keep brain busy. It also prevents thinking about stupid **** for too long too