An extensive statistical analysis of the life-spans of the patriarchs, as given in Genesis Chapters 5 and 11, shows that statistically the life-span can be considered constant before the Flood, while after the Flood the data can be fitted by an asymptotic exponential decay curve. Also, it is concluded that as for the life-spans reported in Genesis Chapter 11, the data in the Masoretic text are the authentic ones; those in the Septuagint have been tampered with. Moreover, it is statistically unlikely that there are gaps in the genealogies in Genesis Chapter 11.