For most of those cyclist that ride many miles every year I'd have to wonder if the drop bars most use don't cause prostrate issues.

The drop posture will put increased pressure on the whole perineal region of the body thus irritating an aging prostate. A more upright riding posture might just avoid. or at least ease, prostate issues for most older riders. That could also explain why I ,at 67, have no problems with my prostate since I ride upright all the time.