The public and many fitness professionals seem to dismiss declining testosterone levels as a consequence of the aging process, but a new study seems to show that if you can avoid smoking, obesity and depression, you can maintain your testosterone as you age.  Low testosterone has been shown to be associated with fatigue, erectile dysfunction and loss of sex drive, low lean mass and low bone density.  It is clear that if you practice consistent exercise with proper nutrition to improve your overall health status, you can avoid health problems such as low testosterone, which could be the root of many others.