If those leftist, "woke" anti-gunners (who are completely overcome with dumbassery, anyway) consider 18-20 year olds to be unfit - too immature, ignorant, etc - to own handguns... ask them how they think those same 18-20 year olds are in any way qualified to vote. Watch the resulting rapid gasping, and shocked facial expressions!
But be prepared to duck quickly. Those anti-gunners are violent critters when provoked. HG Wells once said that "the first person to raise a fist in anger, is the first to have stopped thinking!" Anti-gunners constantly demonstrate (prove conclusively) that they sure-enough stopped thinking, a long time ago.