Hi George, I just realized that I had left "Why does it work" as a filling while I tried to remember my standard question to couples who have been together for decades and I never changed it. I think I used to ask something along the lines of "Why do you think you get along so well?" or "Why has it worked so well for so long?" Let me know if you have a better idea. I won't have any other submissions for the day. Thank you.