I'm still waiting...
Either I missed this, being too busy enjoying life...will still experience it someday...or it is a myth, promulgated by the advertising industry, the pharmaceutical industry, or the psychiatric industry. If I haven't reached midlife, then I will have a long life! More likely, there is probably no such thing, rather it is an excuse used by weak, incompetent, or foolish men.
On the other hand, I know from experience that menopause is real: it is hormonal and makes the life of a woman unpleasant (and requires patience and understanding in men). Empathy is difficult. Perhaps "midlife crisis" was invented by men to assuage women...or as an excuse for acting foolishly.
Prior to writing novels, the author enjoyed a multifaceted career: from decorated combat aviator to advertising professional to global communications director of a major consumer brand. He has traveled the world and met sports, film and television stars, political leaders, and royalty. He graduated from Middlebury College, is married, lives in Germany, and has two grown children.