Earth’s age is 4.54 billion years, and life on earth began about 3.5 billion years ago.
Scientists have determined that Earth is 4.54 billion years old, with a 50 million-year margin of error, by dating the rocks in its ever-changing crust as well as the rocks in Earth's neighbors, such as the moon and passing meteorites. The Hadean represents the initial epoch in Earth's history. The word "Hadean" is a reference to the Greek god of the underworld Hades and represents the hellish conditions prevalent after the Earth's original construction between 4.6 and 4 billion years ago.
Even before the 3.5 billion years ago when the earliest fossils on Earth were discovered, just at the conclusion of the time of late intense bombardment, there is evidence of biological activity. Therefore, the window when life first began was very small. Life on our planet began to develop as soon as it was possible.
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