Age Difference Of Humans After The Flood
Prior to the descendants of Noah and within the Adam and Eve bloodline, people often lived about 1000 years. There is no reason to doubt the age of humans as recorded biblically. Accurate genealogy and bloodline were highly important to the keepers of biblical events. Ancient people would have known if the ages were in error so the ages are assumed correct. Therefore, something happened after Noah’s time that changed the life expectancy of the Adam and Eve bloodline and possibly all animals. The life expectancy changes are obvious biblically. In fact, longevity since the flood has diminished at a natural rate. This rate closely approximates a natural exponential decay22.
With less atmosphere would come increased solar radiation to Earth‘s surface and this while the Sun is increasing in intensity. Also, with less atmosphere comes lower atmospheric pressure and lower oxygen levels (per breath). A person’s heart would have to beat faster. Could these factors gradually reduce longevity?
It is also possible that the inter-mating between Adam and Eve’s descendants and existing Homines sapientes caused a gradual genetic change. This genetic change could have reduced longevity.
22 Mendez Sr., Arnold C… Longevity of the Patriarchs.