Particular words used in Greek and Roman cultures before, during, and after NT times provide insight into how those peoples recognized seven identifiable stages of life a person experiences during the aging process, from birth through old age. This is referred to as the hebdomadal system. Because the terms are also found in the NT, identifying their parameters is beneficial for understanding the implications of the various ages of individuals mentioned. Interpreters of the NT will define with greater precision texts that mention age. To accomplish this purpose, this article first examines the concept of life's stages in ancient literature and then considers the seven specific stages of life enumerated in that literature. The final section applies the understanding of the Greek terms for the stages of life to the NT.