I'm 69 and I go to a fitness club to maintain whatever's left of my youth. There, I get to see guys half my age and seriously bulked up, working out. I think to myself that there's no way I could take one of these guys on and expect to win. As others have said, I too have a knee replacement and a bad back, together with everything else afflicting us seniors.

Yes, disparity of force, age, size, numbers, and sex, alone or in combination, can provide justification for deadly force. However, if you live in a blue state, it's probably better to allow yourself to be beaten until your own mother can't tell if you're face up or down in the hospital bed, before drawing and firing.