Genesis 11:10-26

Genesis 11:10-26 shows an immediate drop in life span following the flood, Shem who was born 98 years before the flood lived just 600 years as opposed to 800+ years for his ancestors. Also for those born after the Flood there was a further drop to less than 500 years. And following Babel; as indicated by Peleg; there was a sudden drop of 200 years.