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SW-User
The age of the earth can be determined by radiometric dating of meteorite material (formed at the accretion of the solar system) and the oldest rocks on earth. It still gives a large range in the 4 billions, but once you reach back that far, the large range doesn't matter as much.
Radiocarbon dating can only date to about 60,000 years, so when things are said to be much older than that, other forms of dating are being used.
Radiocarbon dating can only date to about 60,000 years, so when things are said to be much older than that, other forms of dating are being used.