Both of us born ins and married for well over 40 years now.
I think we were just lucky that we hit it off so well, no magic formula, nothing to do with being a JW.
I have non-JW friends married the same length of time but many JW's I know have split up even though neither partner has left the 'truth'. In some cases they are still in the same congregation. I often wonder what these couples think will happen after 'A' when they have to get back together forever. (Assuming they still believe this tosh)
George