It is true that men and women distribute fat differently. Women tend to have more subcutaneous fat. This means that there is a layer of fat just under the skin which is distributed through much of the body. Men tend to have less of this layer of subcutaneous fat and instead their fat cells tend to accumulate more in the abdomen. With age (predominately during middle age), hormone levels drop in both women and men. We hear a lot about menopause in women, but men also have a drop in hormones during this time, and this tends to lead to growth of the fat cells in the abdomen.
Unfortunately, there is no magic solution, as many might hope for. The best and healthiest way to combat belly fat is a low-fat, low-calorie diet (I recommend the Mediterranean diet) and moderate cardiovascular exercise. While abdominal and core strengthening (like sit ups and crunches) can really help build the abdominal muscles, and thus essentially "hide" the belly fat better, they do not do much to decrease the fat overall.