Description: In this paper, presented at the Eastern Spring Meeting of the Society of Actuaries, held March 24-25, 1960 in Washington, D.C., the author documents the determination of elementary functions and monetary values of the 1941 CSO Mortality Table on an age last birthday basis, noting that until this time the tables had been published only on the basis of age nearest birthday. The impetus of this change was the author’s company, Metropolitan Life, having recently started issuing ordinary life policies on an age last birthday basis, the rational being the use of age nearest birthday had led to policyholder confusion and misunderstanding. Includes discussion. From the 1960 Transactions Vol. 12, No. 33.