Gun injuries and deaths so far in 2022. Credit: Gun Violence Archive

WASHINGTON, D.C. — The two young men accused of carrying out the massacres in Buffalo and Uvalde followed a familiar path: They legally bought semiautomatic rifles right after turning 18, posted images intended to display their strength and menace — and then turned those weapons on innocent people.

As investigators and researchers determine how the tragedies unfolded, the age of the accused has emerged as a key factor in understanding how two teenagers became driven to acquire such deadly firepower and how it led them to mass shootings.

They fit in a critical age range — roughly 15 to 25 — that law enforcement officials, researchers and policy experts consider a hazardous crossroads for young men, a period when they are in the throes of developmental changes and societal pressures that can turn them toward violence in general, and, in the rarest cases, mass shootings.

Six of the nine deadliest mass shootings in the United States since 2018 were by people who were 21 or younger, representing a shift for mass […]

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