At some point these may be interesting, I don't want to forget it:

Drinking lots of coffee linked with higher risk of dementia, brain shrinkage, study finds

(today.com)

Too much coffee can shrink your brain, raise risk of dementia: Study

(fox8.com)

Whenever local or even national news or news commentary sites and shows comment on what “studies say,” I reserve judgement (who knows, one day they may interpret the abstract correctly).

Looking at an older pub on a slightly more reputable scientific outlet (you may decide for yourself how to take slightly there):

Caffeine as a protective factor in dementia and Alzheimer's disease

(nih.gov)

Many years from now I'll review the situation, if I remember to do so...