It doesn't seem that unusual for rich people to become more charitable as they get older, though perhaps I'm just hearing about the famous ones. I assume a large part of it is feeling as though one has solved the money-making game, and now it's time to do something new. (Rich people getting into politics is probably similar.)
Is anything known about how to maintain fluid intelligence?
A Google search turned up a few articles:
...Senior citizens who performed as well as younger adults in fluid intelligence tended to share four characteristics in addition to having a college degree and regularly engaging in mental workouts: they exercised frequently; they were socially active, frequently seeing friends and family, volunteering or attending meetings; they were better at remaining calm in the face of stress; and they felt more in control of their lives.
Although there is some controversy and debate on the best ways to improve fluid intelligen
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