"Are walkaway wives generally having midlife crises? Any thoughts on that?"

No not all are MLC. There is usually a trigger that sets off an MLC. Death, getting old, new job, etc.

If a WAS was constantly criticized in their marriage, for example, it's not an MLC. It's just a lousy marriage.

M-43 W-40
2D - 9 and 5

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet a new life.

RECONCILED AND WISER