This version differs from the Septuagint by a total of 586 years.
This is the difference from the Septuagint in the number of years for which each of them lived before their sons were born; apart from Jared, Methuselah and Lamech, who are given the same number of years in both versions.
From the agreement with respect to these three, we can deduce that the version which we use is more reliable, because the longer length of years which is assigned to Jared and his descendants in the Hebrew version makes it clear that the years of their predecessors should also be the same as in the Septuagint version.
If the later and more recent generations are found, with the addition of the hundred years, to be assigned the same number of years in both the Hebrew and the Septuagint versions, how much likely is it that the previous generations, their forefathers, lived to be older than their descendants? For in the summary of each man's life, the number of years before his son was born, and the number of year that he lived afterwards, added together gives the same total of years in the Hebrew version and the Septuagint translation.
It is only the numbers of years before their sons were born which are shorter in the account preserved in the Jewish copies.
Therefore we suspect that this was something which the Jews did: that they ventured to compress and shorten the time before these sons were born, in order to encourage early marriages.
For if these most ancient of men, who lived such long lives, came quite soon to marriage and fatherhood, as their account declares, who would not want to imitate them and marry early?