Soggy:You are right, and I respect that you have tried to avoid scriptural explanations for scientific ideas, but please explain where all the 600 year old people went.
After the flood the life spans of the patriarchs, as recorded in the Bible, declined to what we would consider normal (70 ish). An intersting tid bit on the subject which graphs the decline.http://www.biblestudy.org/basicart/longpatr.html