I mean no disrespect of course, and I understand that age may affect your ability to physically defend yourself, and so may many other things.
But again, can your threat be taken down before he gets to you?
Can you get yourself or your loved ones out of the way while shooting/reloading/moving?
Do you practice enough with a gun that you can do this under pressure? Age affects more than just hand to hand skills.
This problem was solved without violence, which is always the best way, but no one expects a man to react that way, who are we to expect that he won't charge a man holding a gun?
"Today is victory over yourself of yesterday; tomorrow is your victory over lesser men." - Miyamoto Musashi
[Insert random irrelevant religious quote here]