As the article states, "If men start paying as much attention to their testosterone blood levels as they do cholesterol, the incidence of degenerative disease would plummet."
Low levels of testosterone ave been linked by good research to increased risk of dying prematurely, heart disease, osteoporosis, muscle wasting, and chronic neuro-degenerative diseases. I have seen many men with depression and chronic fatigue related to their low levels of free testosterone.
The blood test is widely available and in my experience most insurance plans pay for the test.
An excellent book on this subject is The Testosterone Syndrome by Dr. Eugene Shippen, MD.