It never fails to astound us how few academics can manage to distinguish the difference between a privilege like driving or alcohol consumption and the exercise of an enumerated civil right.
Mental health problems often develop in people’s 20s, and the parts of the brain that control impulse and judgment continue to develop in those years. That’s probably why all our most notorious assassins were in that decade of life: The men who shot Representative Gabby Giffords, Ronald Reagan, John Kennedy, Robert Kennedy, even Abraham Lincoln were all 22-26 years old. That’s an incredibly narrow age range.
Even the most selfish politicians might pause to think how much safer they’d be if men in their 20s didn’t have easy access to guns. Of the deadliest shootings in the past five years, seven out of 10 were committed by people under 30.
Requiring people to be 30 to buy a gun would also cut down on gang access to guns. Right now, any 21-year-old with a clean record can buy stashes of handguns and sell them to gang members and teens. But it’s a bit harder to find a 30-year-old who has kept their life clean enough to pass a background check, probably has kids and a job themselves, but would be willing to buy guns to put in the hands of local troublemakers.
— Gregory Smithsimon in How about a gun ownership age of 30?