Buy Viagra Study

The prevalence of erectile dysfunction (male impotence) in six age groups of moderate and severe cases:

for men aged 23–29 Moderate 1.8%, Severe 0%

for men aged 30–39 Moderate 2.6%, Severe 0%

for men aged 40–49 Moderate 7.6%, Severe 1.0%

for men aged 50–59 Moderate 14.0%, Severe 6.0%

for men aged 60–69 Moderate 25.9%, Severe 15.9%

for men aged 70–79 Moderate 27.9%, Severe 36.4%

(Ken Marumo, Jun Nakashima, Masaru Murai (2001) Age-related prevalence of erectile dysfunction in Japan: Assessment by the International Index of Erectile Function International Journal of Urology

Recent, but fragmented, erectile dysfunction studies confirm this data.