Scholars routinely look with suspicion on the dates and ages given in the early chapters of Genesis. Several passages are confusing, multiple textual traditions have been preserved with differing numbers, and historians have had difficulty in reconciling the biblical numbers with the histories of other nations. The numbers given in the various texts of the Scriptures will be taken at face value. Others can worry about the validity of the numbers. The goal is to show that the lifespans of Old Testament people born after the Flood reveal a numerical pattern known as an exponential decay curve. Thus, the purpose of this paper is to derive a mathematical equation that predicts, with reasonable accuracy, the lifespan of people born after the Flood, given the number of years that they were born after the Flood. This is true for all of the texts examined. It will further be shown that only the Masoretic text predicts that the human lifespan will level off to approximately 70 to 75 years.