Scientists have unearthed a possible reason why men tend to die at younger ages than women: Those who lose Y chromosomes from their blood cells as they age may be more vulnerable to heart tissue scarring and heart failure.
Researchers do not know why it happens, but it is associated with aging: It's detectable in an estimated 40% of 70-year-old men, and more than half of those who live into their 90s.
"The question is, is loss of Y simply a marker of aging, like graying hair?" said study co-author Kenneth Walsh. Most people know the Y chromosome as a sex chromosome: Women have two X chromosomes, while men have an X and a Y.
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