There were tons of people
who answered another question that may have been on a different website
who had had strokes in their 20's and sometimes even younger.
By any chance was your stroke a carotid artery dissection? This one is the most common one for people ages 30-60 which is also considered young for a stroke. And what generally causes it is trauma from a car accident, chiropractic treatment, sneezing, coughing, or just spontaneously for no reason.