When did earth start to exist?

Answer 1

Some people say that the Big Bang began it. This, however, is just a theory. To this day, scientists, still do not know how humanity and life on our planet came to be.

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The Big Bang Theory models the Universe as a whole, and so far at least is the nearest theory to fit observations and calculations; but it leaves the uncomfortable "What came before?" question.. The Solar System is much younger.

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The two nouns in the second sentence ought be the other way round - Life in general came first, almost certainly as single-celled organisms first, but you are right that the actual mechanism has not been determined. We hominids appeared within the last 3 or 4 million years, very recently in geological terms, with our own species probably less than 1 million. It's hard to know because land animals from the time did not leave many fossils, compared to the rich assemblages of marine fossils.

Answer 2

Earth is estimated to have formed around 4.5 billion years ago, based on the age of the oldest rocks and meteorites. This age is determined through radiometric dating methods that analyze the decay of radioactive elements in these materials.

Answer 3

The planet Earth is old of approx. 4 500 000 years.