Theory is increasingly important in social gerontology. Thus it is grati-fying to see the debut of a new journal that encourages theorizing about age and aging. The papers in Volume 1, number 1 of the International Journal of Ageing and Later Life reflect a concern for developing theory that is laudable. I hope that in the future researchers who submit manuscripts to IJAL and the reviewers who evaluate them will share this concern for building theory. This is because we are at a tipping point, a watershed, in the development of knowledge about the social and psychological dimensions of aging.