Erectile dysfunction affects most men at one time or another in their life and the chance of occurrence only grows with age. A 1999 survey conducted by the National Ambulatory Medical Care Survey (NAMCS) reported that 22 out of every 1000 men sought help for ED. That's 2% of the population! And almost 50% of men between the ages of 40 and 70 experience difficulties getting or maintaining an erection.