As a serious reference and not a snarky reply, I encourage you to read this book
It, along with others, plus the direct advice of Matt Bracken, convinced me that for our family and our home, a Bug Out plan is the ONLY way.
We simply are not prepared or capable as empty nesters to defend in place.
If you think you can, more power to you. I just happen to think you are wrong, and I presume you live in suburban America, and I may presume incorrectly.
I'm single, the kids are grown, the grandkids have at least met me.
I still accidentally walk up on local cops and scare the crap out of them because I forget to make noise.
There isn't a single solution to a potential problem. Personally, I'd rather die in my bed at age 90, but if that doesn't happen, I'm ok with that.
I expect I'll be here on this ground I was born on until I die.
We have a suburban home, and a remote ranch in the sierra. each has its drawbacks; some decision making is always going to be necessary, but if you make a big noise, you will have a big reaction on your hands.