I think, actually I know women go through more life changes and transitions than men. I would think especially more towards the late thirties early forties as their fertility lessen. they probably ask themselves especially after taking care of children aging parents and sacrificing themselves for their husbands and their families what more is there to life and what do I want to do hence the midlife crisis, or in a more healthy terms midlife transition. Again I can understand how a codependent relationship can lead to a loss of identity and purpose, I just can't understand how it got there in the first place, and why it is rarely expressed in the relationship, and the significance of the relationship until it is too late. How can we be better men at understanding these things recognizing them, and addressing them before they become a major marital problem? How can we use met tell when our spouses are truly happy rather than just pretending to be happy? Because the way it appears to us is the transition comes on very suddenly because we failed to recognize the warning signs.