It is well known men lose testosterone with Age. Testosterone has many physiological actions in muscles, bones, brain and adipose tissue. Within these areas it stimulates muscle growth and maintenance, bone development, the production of red blood cells, libido, enhanced mood and cognition and erectile function. Deficiencies in testosterone can cause frailty, poor muscle quality, muscle weakness and impaired neurotransmission. An older male with Low T may present with symptoms of fatigue, decreased energy, decreased motivation, cognitive impairment, decreased self confidence, depression and irritability.
Testosterone deficiency is also found in males with type-2 diabetes, coronary artery disease, stroke, and cardiovascular disease. Early studies suggest TRT in men with low testosterone levels may lower blood sugar and reduce abdominal fat all of which may be protective of the cardiovascular system.
A major health concern has been prostate cancer however, there is no evidence that supports the idea that testosterone causes the development of new cancer.
In summary, aging men can increase their overall health by treating low or lowish levels of testosterone under the care of a licensed provider.