This is not true, although there are some age-related changes that may affect sexual function. An example is a decrease in libido related to hypogonadism. The etiology of erectile dysfunction may be broadly categorized as organic, psychogenic, or mixed. Organic causes may be vascular, neurogenic, hormonal, or pharmacologic. They may be related to surgery or radiation.
Organic disorders account for the majority of all cases of erectile dysfunction.
Because adequate arterial blood supply is critical for erection, any disorder that affects blood flow may be a cause for erectile dysfunction. Hormonal and psychological factors may also play a role. Most cases of erectile dysfunction are multifactorial in etiology, with organic and psychologic aspects. This requires a multidisciplinary approach to assessment and treatment. Erectile dysfunction is a widespread and under-reported disorder affecting millions of men.