It’s called testosterone deficiency syndrome, and it can negatively impact a man’s life and health in various ways.  It is found in both men and women actually, and it plays an important role in libido and energy levels as a male sex hormone for the most part.  It is active all the lifelong.  But according to some, testosterone levels actively decrease with age.  After you turn 40, they decrease by about 1.2% per year.  In short, over a lifetime or by the time he hits 70, he could lose about 35% of his original testosterone levels. 

Men who suffer it could be diagnosed to some degree with what’s called male menopause.  But it results in a loss of sexual desire, ED, poor concentration, increased body fat, fatigue, reduced muscle mass, depression, and hair loss.  1 in every 5 ED patients apparently suffers from this particular disorder.  All in all, testosterone deficiency syndrome is not as common as many would think.  So being bald does not necessarily mean that you have TDS, nor does ED.  Sometimes you can have those conditions independently of each other.  However, if you have TDS, you are probably going to suffer those symptoms.