In this issue of Urologic Clinics of North America, guest editor Dr. Kevin R. Loughlin brings his considerable expertise to the topic of Testosterone. With about 2 out of 10 men older than 60 years having low testosterone (American Urological Association), coupled with an aging population, this issue is an important resource for all urologists for effectively treating men and improving outcomes. It provides a current update on testosterone in men from top experts in the field, covering prostate cancer treatment, the use of anabolic steroids, hypogonadism, testosterone replacement, and more. ...