This paper was written as a draft of the author’s contribution to a recent publication. See Craig L. Foster, David Keller, and Gregory L. Smith, “The Age Joseph Smith’s Plural Wives in Social and Demographic Context,” in Newell G. Bringhurst and Craig L. Foster eds., The Persistence of Polygamy: Joseph Smith and the Origins of Mormon Polygamy, (Independence, John Whitmer Books Press 2010), 152-183.