Four ways to understand the Earth's age - Joshua M. Sneideman
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Evolution of Earth Timeline : From the Birth of Earth and Beyond
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COSMOS A SpaceTime Odyssey | Age of The Earth
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World’s Most Asked Questions: How Old is Earth?
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How do we know The Age of The Earth?
The age of Earth is estimated to be 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). This age may represent the age of Earth's accretion, or core formation, or of the material from which Earth formed. This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.