This is the cause of Faster Old Men

Research shows, men were more rapid aging than women. This is because the body's immune system in men age faster. As a result, his body is more easily exposed to the disease than women. This resulted in women the opportunity to live longer than men.
"Age-related changes in the immune system in a variety of women and men. These findings indicate, immune parameters were decreased more slowly in women causes it to live longer, "said research leader Professor Hirokawa Katsuiku of Tokyo Medical and Dental University who published research in the journal Immunity and Ageing.
Hirokawa conduct a study to analyze blood tests from 356 healthy volunteers aged between 20 to 90 years. Researchers counted the number of white blood cells and molecules of cytokines, signaling the body's immune system.