Apostolic seniority is generally understood to include all ordained apostles (including the First Presidency and the Quorum of the Twelve Apostles. Seniority is determined by date of ordination, not by age or other factors. If two apostles are ordained on the same day, the older of the two is typically ordained first. See Succession to the presidency and Heath, Steven H. (Summer 1987). "Notes on Apostolic Succession"(PDF). Dialogue: A Journal of Mormon Thought. 20 (2): 44–56..
