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One year-old user explains why Viagra is not just for old men and why he Within a few weeks I was more comfortable with Rachel and. More than a third of men under 30 reported they were affected by erectile dysfunction (ED). Slightly more than 40 percent of men in their 40s. Men in their 30s and 40s also have erectile dysfunction, and Viagra is being marketed to an ever-wider audience, including younger men and even women.