[jamager]

> What is "good for one's brain" (apart from proper nutrition and absence of concussions) is a strong education and healthy lifelong social interactions

Sure, but I think this is more about the fact that what you don't use, you lose. Learning languages is hard, so even learning old Greek keeps you brain sharp as long as you enjoy it to some extent.

Gym for the brain is good, what you do with it can be better, but gym is still good.