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Listing old, famous intellectual people that have retained their wits is poor a excuse for evidence, since we don't know the ratio between old and famous intellectuals that have lost their wits vs that have retained them.

We also don't know the ratio of those who could retain it if they would keep thinking hard every day. It's really a lifestyle choice. You can still be wise, but when you have a lot of money you can just relax and enjoy the nature without wondering how it works. Some people just love thinking and studies suggest that it keeps them good at it (refs in that book).

I didn't mean to show by these examples that this is the default, or even that it's common. I don't think it is. But I hope it's getting better, mostly thanks to the technological progress which can be stimulating for those who choose to make use of it.

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