Education does not appear to help protect against dementia
Although some studies have theorized that the extent of your education might help protect against dementia, a new piece of research found that night to be true. However, the lead researcher does think that doing activities later in life that involve memory and thinking skills—such as cognitively demanding work, learning another language or staying involved in social activities—may be helpful.
https://www.medicalnewstoday.com/articles/324357.php