Sildenafil
"I never needed Viagra until I was 63 but then I started having trouble keeping an erection. I started taking 20 mg pill a few months ago and feel like I am as strong as when I was 30. Hard to judge when to take pill though because young wife sometimes is just worn out from work. Doesn't matter though because it doesn't seem to get me hard with out some stimulation anyways. Other times even if I haven't taken a pill in a day or 2 I am still able to get my erection.  It is well worth much more. I have read about these guys going for an hour or more. At 63 that would give me a heart attack."