Unless one has children,it is the smart thing to do to stay in your bedroom.
Let the bad guy come to you under conditions you control.
Then zap him.
Encountering the bad guy while walking down a hallway or past a bedroom door is even more dangerous than encountering him outside because your encounter will be at very close range, much closer than outside.
Probably didn’t have kids at 80.
If he comes in the house, he would have heard him.
Wait, shoot.