Among men over 40, trouble becoming erect is one of the most commonly reported sexual issues.[1]
Even in the absence of other health problems, physical and biochemical changes that occur as a result of aging may be partly—or even mostly—to blame for this problem.
One such issue is a decrease in nitric oxide production, a compound in your body that is key to promoting healthy blood flow. This biochemical issue can lead to a physical problem—lack of blood flow—which can contribute to an inability to perform in the bedroom.