Certainly not everyone can serve in the same capacity, but almost everyone can serve in some capacity. Be all you can be
It's a matter of demonstrating that to get those rights, you have to have put some skin in the game.
But back to the OP - Both my kids were taught how to make most firearm designs safe, along with pretty sensible do's and don'ts at the age of 14. Not sure they'd be great at unloading a single-action revolver with a loading gate, but they understand all the principles and have some hands-on experience.

