Three decades ago (when I turned 55) my wife started using those words to end any argument or differing-point-of-view discussion we got into...
Fortunately that only lasted for a couple of decades... Now she is almost 81 and she has switched to reminding me of bad things I did before we were married 60-years and 11-days ago...
OTOH, Jose Conseco aside, here in MD we are surrounded by hundreds-of-thousands of aliens...
When I was a kid I noticed that my grandparents used to argue all the time.
I quickly figured out that they both made a very simple mistake—they were both convinced they had perfect memory and the other person had a faulty memory.
The best way to end an argument about the past is for either partner to plead senior lack of memory (even if they _know_ the other person is wrong).
It works!