Public health brings unique perspectives and tools to the quest for healthy aging. How can those in the fields of public health and gerontology work together to improve the lives of older people? This issue presents the latest, most effective approaches to promoting healthy aging, developing aging-friendly communities, and fostering health equity. The guest editor is Steven P. Wallace, a professor in the UCLA School of Public Health, associate director for public service at the UCLA Center for Health Policy Research, and chair of the Gerontological Health Section of the American Public Health Association.