Heart attack: The incidence of heart attack in 21 year olds is low. If there are metabolic or congenital reasons which raise the probability for an individual, it is certainly possible for a 21 year old to have a myocardial infarction.
Answered 7/25/2013
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Small risk: Very small if you are otherwise healthy and don't smoke.
Answered 7/25/2013
5k views
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