Old age represents a new frontier. The number of older people is increasing throughout the world. This changing demography affects individuals, but also families, communities and societies. The focus of this special issue is the well-being of older adults on different continents. Scientists from around the world address this issue using a wide array of research designs and methodologies to provide a broad perspective on aging. Five topics are considered: Well-Being among Older Adults; Social Support; Functional Status, Well-Being, and Successful Aging; Cross-Cultural Approaches to the Study of Aging; and Research Perspectives in Aging. This volume clearly demonstrates that scientists have much to contribute to the goal of optimizing the experience of aging and creating a society for all ages.