If we assume that Sariah was 18 years old at the birth of Laman, and Laman was 22 years old when Lehi left Jerusalem, Sariah would have been close to 40 years old at that time. If Jacob was born 3 years later, she would have been 43, and if Joseph came along 2 years after Jacob, Sariah would have ended her childbearing years at the age of 45 (which age is not completely unreasonable). Therefore, it is reasonable to say that when Lehi left Jerusalem, Sam would have been about 18 years old and Nephi would have been about 14-16 years of age, or "exceedingly young" (1 Nephi 2:16). Certainly these ages are estimates, but they accommodate the scriptural story. The reader should realize that there are many factors embedded in the scriptural story that have to be satisfied when one attempts to shift the ages. [Alan C. Miner, Personal Notes]