Strokes are increasingly affecting younger people, according to a new study out of London.
The number of strokes in people ages 20 to 64 has jumped by a quarter. That means the number of strokes worldwide could double by 2030.
Researchers say most still happen to the elderly, but there's a growing number of young people with risk factors for stroke, including obesity, diabetes, and high blood pressure.
"If young people understood how debilitating a stroke is, maybe they would change their behavior," Majid Ezzati of Imperial College London, one of the study's authors, said.
The study, financed by the Bill & Melinda Gates Foundation, was published online Thursday in the journal Lancet.