I assume that many of us have.

Wikipedia defines this as such: The Irritable Male Syndrome (IMS) is a recently-coined term for a set of symptoms thought to be caused by a drop in testosterone levels in male mammals. It is a striking feature in male seasonally breeding mammals associated with the end of the mating season. These symptoms are similar to those of the so-called male menopause (also known as viropause or andropause).
In humans IMS is defined as involving the hormonal, physiological, and chemical changes that occur in all men generally between the ages of 40 and 55, though it can occur as early as 35 or as late as 65. These changes are considered to affect hormonal, physical, psychological, interpersonal, sexual, nutritional, economic, social, ecological, and spiritual aspects of men's health. One of the most consistent symptoms is anger and sullen withdrawal present in men between the ages of 40 and 60.
Here is a great online conversation I've found that could be informative for both men who might think they have this problem, or women who think their men have this problem.
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