Food for thought.
My H coined it a midlife issue long before I realized that was what was going on.
He never denied it. He also was uncomfortable with the term when I said it but he himself has used it quire frequently. MLC's have such an embarrasing stereotype, perhaps that is why so many are reluctant among other things.
"I have been studying the traits and dispositions of the "lower animals" (so called) and contrasting them with the traits and dispositions of man. I find the result humiliating to me."
Mark Twain