I've noticed Mr J flaws way before the 2 years mark and he mine. With OW1 things laste 18 minths on the open, OW2 has been on the open for over 4.5 years.
For me there will be no stage 5 of the article (Child Stage). Stage 7 (Older Relationships, the Third Honeymoon, Mature Intimacy) maybe but doubt it will be with Mr J.
In the article they say "A midlife crisis is a normal part of the maturing process.". A midlife crisis is not a normal part of the maturing process, a midlife transition is a normal part of the maturing process.
Midlife Crisis is an anomaly of the maturing process. It is when something (or lots of things go wrong). If it was normal everyone would have one. That is not the case.
Sometimes good things fall apart so better things can fall together. (Marilyn Monroe)