The 4.6 billion year thing sounds like a wild guess to me, but im not a sientist...
As for the young earth theory....
I have heard people say that carbon dating is wrong and that the earth is only 2,000 years old might have been another number but it was small
compared to 4.6 billion.... Carbon dating may be wrong but how did they come up with the 2000 estimate?
In your article,
First it says less than 10,000 then it says only a few million... There is a big difference there.....
My point is we will never know how old the earth is because we dont know what 1 billion years ago looked like...
Maybe if we take a piece of paper or a modern device and write the date on it and keep it safe and store it for thousands maybe millions (doubt it)
years then develope a way to test the age on it. This way we will know when that thing was made and can test age guessing more accurately and on a
larger scale. Of course we ourselves will never know but the future of humanity will
A farfetched idea but so is the age of the earth theories....