Luke Perry’s death, following a massive stroke, is both a tragedy and a bit of a mystery. The actor was just 52 years old, and the vast majority of strokes occur in much older people. Mr. Perry’s family has not offered details about the medical findings, but deaths from stroke in younger age groups are rare. About seven in one million Americans under age 50 die annually from strokes caused by a blocked blood vessel, and nine per million die from a brain hemorrhage, the two main types of strokes.
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