This issue is devoted to older men’s health, which has long received inadequate attention among researchers, clinicians, and policy makers. Given that more than 39 million Americans currently are men 50 years of age or older, with the number expected to top 50 million by 2010, and given the relatively advantageous position of men in society, how could older men be overlooked? Yet, as our guest editor Edward Thompson contends, they do constitute an unseen minority when it comes to their health. Here, then, is a look at how gender, health, and aging interact, with important implications for older men, families, and practitioners.