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Researchers into mass shootings have found that attacks are overwhelmingly carried out by men whose ages are strikingly clustered around two key periods in their lives.

United statesHamline universityJillian petersonEric madfisJustice anthonym kennedyPeter langmanRahul soodRoperv simmonsKami chavisJames densleyFrank robertzInstitute for violence preventionWake forest university school of lawMarjory stoneman douglas high school in parklandSupreme courtCincinnati children hospital medical center