The World Before Noah’s Flood May Have Had 20 Billion People
If each woman had 20 children, not outlandish if she had 200 years of fertility, the world's population by the time of the flood could have been in the neighborhood of 20 billion, over twice the world's population today.
In Douglas Wilson’s own words: 1 quote from 2026, from Blog & Mablog, cited to the source.
Given the lifespans and all these conditions taken together, there's no reason to think that the global population was tiny at the time of the flood. If each woman had 20 children, not outlandish if she had 200 years of fertility, the world's population by the time of the flood could have been in the neighborhood of 20 billion, over twice the world's population today.