One of the sites in the prior post says 25 billion..........
4.543 billion
years
Earth, Age
Age of the Earth - Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Age_of_the_Earth
Rocks returned from the Moon have been dated at a maximum of around 4.4
and 4.5 billion years old. Martian meteorites that have landed upon Earth
have also been dated to around 4.5 billion years old by lead-lead
dating.
How Science Figured Out the Age of Earth - Scientific American
www.scientificamerican.com/.../how-science-figured-out-the-age-of-the-earth
Editor's note: The following is the introduction to a special
e-publication called
Determining the Age of the Earth (click the link to see a table of contents).
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