According to a 2019 study published in the International journal of geriatric psychiatry people with a history of migraines were three times more likely to develop any type of dementia and more than four times as likely to develop Alzheimer's disease (1).
The Sky-Rocketing Rise in Dementia & How You Can Prevent It
The Global Burden of Disease (GBD) systematic analysis was published in 2016 in The Lancet - Neurology. They found that the number of dementia sufferers worldwide grew by 117 percent in 26 years from the years 1990 to 2016 (1).