Researchers cite rise in blood pressure and diabetes, but one specialist questions the findings.
Stroke is the fifth leading cause of death in the United States.
Strokes are typically associated with the elderly, but new research suggests that strokes are increasingly happening to Americans under 65.
The study looked at a sample of data from some U.S. stroke hospitalizations. From 2003 to 2004 in this sample, more than 141,000 people from 18 to 65 were admitted to hospitals for stroke. By 2011 to 2012, that number had risen to more than 171,000, researchers found.