What does this study add?

• The median age at migraine diagnosis was 49 years old and 70% of the cohort were women.
• Compared with individuals without migraine, there was a 50% higher rate of dementia among individuals with any migraine diagnosis.
• The dementia rate was twice as high in migraine with aura than without aura.
• Dementia rate was higher with more frequent hospital contact for individuals with migraine compared with individuals without migraine.