Testosterone does drop with age but certain things, such as a lot of belly fat, can cause it to plummet. With it can go your sex drive and even your erectile function.
Low levels can be corrected by losing belly fat (follow a good diet and get lots of exercise). If your doctor is seriously concerned, there are prescription anti-estrogen pills, gels, and injections that will block the effect of belly fat until it’s lost naturally. Dr. Mehmet Oz (Vice-Chair and Professor of Surgery at Columbia University) has plenty of health challenges that provide diet and exercise tips -- even one that lets men keep the beer.