Banner Boswell Medical Center in Sun City, Arizona is a unique hospital. Located in the first community designed specifically for patients over 55, the hospital has had the unique task of serving an active, older population. Nationwide, the average age of an emergency department (ED) patient is 48 years-old, but, at Banner Boswell it’s 74. despite a growing population, the hospital has not had a significant renovation in more than 30 years.