I had them in my 20s on a weekly basis but since I could stave them off with massive water intake I thought they were something else. I didn't get optical symptoms, it was just a really bad headache, nausea and chills that felt like a bad hangover. It wasn't until my 40s when I started getting optical migraines (which are scary as hell since they mimic a stroke) that I went to a dr and he diagnosed me. Apparently it's common for migraine sufferers to transition to optical migraines when they're older.