Based on current scientific knowledge, it is currently postulated that the Earth has an estimated age of:

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**Solution:**

1. The estimated age of the Earth is approximately 4.54 billion years.

2. This is equivalent to 4,540,000,000 years.

3. The closest option given is about 4,50,00,00,000 years (4.5 billion years), which matches the scientific consensus.

4. This age is determined through radiometric dating of meteorites and the oldest Earth and lunar samples.

**Answer:** about 4,50,00,00,000 years

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