Although the aging homeless are relatively invisible in the media and throughout the literature, it is estimated that twenty percent of the U.S. homeless and thirty-three percent of London's homeless are aged fifty and over. This article explores the link between the law, aging, and the homeless. The historical evolution of homelessness in Western civilization is traced as the moral economy of charity gave way to the criminalization of this vulnerable group, and then to a modification of criminalization. Perspectives are offered as to how current laws in Great Britain and the U.S. affect the aging homeless, and how the law may be used to address the problem. The compounding factor of mental illness is also considered. (Available electronically through Elsevier Services.) (abstract by the National Center on Elder Ebuse)