Extracted from The Mayo Clinic site.

Less interested in sex lately? Tired? Grumpier than usual? Is this a midlife crisis brewing? Or are you feeling the normal hormone changes associated with aging? Hormone changes are a natural part of aging for men. But male menopause is not an accurate description. Unlike the more dramatic hormone plunge that occurs in women during menopause, hormone changes in men occur gradually, over a period of many years, the effects of which are often subtle and not noticed until much later in life. Some men are never affected by lower hormone levels at all — while some have physical and psychological symptoms that can include changes in sexual function, energy levels or mood.
While the term "male menopause" is sometimes used to describe decreasing testosterone levels related to aging, Todd Nippoldt, M.D., an endocrinologist at Mayo Clinic, Rochester, Minn., prefers the term "andropause."
What are the symptoms of andropause?
Lower than normal testosterone levels do not cause symptoms in all men — and signs and symptoms of low testosterone vary from person to person. Some of these signs and symptoms are a normal part of aging. The only sure way to know whether you have low testosterone levels is through blood tests.

Signs and symptoms of low testosterone can include:
 Reduced sexual desire
 Infertility
 A decrease in spontaneous erections (such as during sleep)
 Swollen or tender breasts (gynecomastia)
 Loss of body and pubic hair
 Small or shrinking testes
 Height loss and thinning bones
 Reduced muscle bulk and strength
 Hot flushes and sweats
 Decreased energy, motivation and self-confidence
 Feeling sad or depressed
 Poor concentration and memory
 Sleep apnea or other sleep problems
 A low red blood cell count (mild anemia)
 Increased body fat
 Diminished physical or work performance

Testosterone replacement therapy

Treatment of low testosterone due to aging with testosterone replacement therapy (TRT) is controversial. The benefits of TRT are not clear, and it may increase the risk of prostate cancer.
While it has been shown to help some men with low testosterone, TRT has risks, especially for men with certain health conditions such as prostate cancer and heart disease — and it may not improve your symptoms. More studies need to be done to determine the effectiveness and safety of TRT in aging men, and who can benefit most from this type of treatment.

Herbal supplements: Do they work?

Although many herbal supplements are widely marketed with the claim that they can relieve symptoms, none has been proved safe and effective for aging-related low testosterone. One of the most common supplements marketed to treat this condition, DHEA, may increase the risk of prostate cancer. More studies are needed to evaluate possible health benefits — and dangers — of taking DHEA or other supplements.

If you are an older man and you have bothersome symptoms you think might be caused by low testosterone, see your doctor to get a firm diagnosis and find out your treatment options. While low testosterone does cause signs and symptoms in some men, your symptoms may be caused by normal aging or something else. Identifying and treating other health issues that can cause or worsen symptoms, making lifestyle changes, or changing the type or dose of medications you take may be enough.

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Amazing information you have shared about male menopause or a perfect word "Andropause"