Does Coffee Really Prevent Dementia?

Neuroscience, Psychology, and Health
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Claims that coffee prevents dementia are lukewarm at best

Researchers in the US found that postmenopausal women who consume an average of 261mg of caffeine a day (the equivalent of two to three cups of coffee) are at lower risk of cognitive impairment or probable dementia, than those who consume lower levels of caffeine.

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However, caffeine consumption was based on self-report and decaffeinated drinks were not specified, it was presumed all coffee, tea and cola drinks were caffeinated.

In addition, the results were modest to say the least. While researchers estimated the preventative effect was 26% (not 36% as widely reported in the media), according to the maths used by the researchers, the actual figure could be as low as 1%.

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Overall, it cannot be said that women consuming more caffeine are at a lower risk of developing cognitive impairment or probable dementia. More research is needed to identify whether there are mechanisms by which caffeine may be a protective factor in cognitive functioning.

Claims that coffee prevents dementia are lukewarm at best

Memory techniques to change your habits
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People who drink coffee regularly may also be doing so because they are still mentally active (e.g., in the workplace with a cognitively demanding job) vs. being retired. It’s hard to control for that and other confounding factors.

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There is another coffee study here, which is interesting:
Caffeine Use and Alexithymia in University Students

Also this:
Coffee Drinkers Have Trouble Talking About Emotions?

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Coffee is the G O D B E A N.