Why is the title so misleading? That isn't at all what the study measured. Just read the article
1) looked at a group of 80-year-olds for 8 years
2) checked their economic status throughout life using reading and leisure time (# of library and museum visits as a proxy)
3) Found that higher scores in lifetime enrichment were associated with a 38% lower risk of Alzheimer’s disease and a 36% lower risk of MCI.
They did everything possible so you wouldn't draw the idiotic conclusion and yet you still clickbait. Shameful! A rise in shark attacks doesn't increase ice cream sales. Reading and writing Absolutely CANNOT lower dementia risk and you are a liar if you claim otherwise. If you want to lower your dementia risk be born with a higher SES.