He’s a Fudd and an idiot. The militia was defined in 1792 by Congress to mean all free men between the ages of 18 and 45 and has since been amended to include all people.
And, not unimportantly, as an alternative too a standing army, which the Founders thought to be a threat to liberty. Leftist logic would have us believe that because the threat now exists, we no longer need to defend against it.