Are migraines and dementia connected?

I've been struggling with Migraines since I was 7 yrs old. I've noticed that each time I have a migraine it gets harder and harder to remember things and sometimes I can not remember what I did the day I had the migraine. I saw from a health journal that links to Ginko Biloba help people with migraines and since that deals with helping people "remember" I was wondering if maybe those with Migraines may suffer from dementia later on down the road. Any help would be appreciated in this matter.