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...