low testosterone is extremely common up to 30% of men over the age of 45 have low levels of testosterone and low levels of testosterone and hypogonadism which is the clinical syndrome associated with low testosterone is extremely common in fact when you look at hypogonadism or the clinical symptoms associated with low testosterone about 20% of men over the age of 60 30% of men over the age of 70 and nearly half of men over the age of 80 suffer from symptoms now what sympt symptoms can you see so men who have a low level of testosterone can have symptoms including brain fog sexual dysfunction including low desire difficulty with erections uh mood changes difficulty in gaining muscle mass having increased weight due to increased fat fatigue and even just loss of Vitality or energy for the things that you used to do