I think you should be at least 21 to own a gun period. Also there shoudl be strick mental evaluations before allowing said guns to be bought. I know some people slip through of course. i think it would prevent some of this for sure. (if you bring up military starts at 18 then sure, however they are usually run through extreme tests and if they serve the country they shoudl be able to at 18) Noticed the govenor said the person didn't have any signs of mentail illness, yet seeing messages from the people that knew him, he defintely did