Questions like this seem like they should have a straightforward answer, but are actually quite difficult on account of two major obstacles: lack of data, and not knowing how to use the data we do have. read more
Data from the Roman Empire: Life expectancy at birth was 20-30 years, life expectancy at age 10 was 45-47. This indicates that a lot of children died before the age of 10, seeing that the average is about half of what it could be. read more
Methuselah's lifespan overlapped Noah by 600 years, and Shem by 98 years. Methuselah's name means"when he dies it shall be sent" probably meaning the flood. There were 126 years between the death of Adam and the birth of Noah. read more