This information is based on the best scientific evidence available, including:

* Radiometric dating: Scientists use radioactive isotopes found in rocks and meteorites to determine their age. This method gives us an estimate of the age of the Earth.

* Lunar samples: Analysis of rocks brought back from the Moon by Apollo astronauts provides additional evidence for the age of the Earth-Moon system.

* Meteorites: The age of meteorites found on Earth provides a constraint on the age of the solar system, including Earth.

It's important to note that this is an estimate, and there is some uncertainty in the exact age of the Earth. However, 4.54 billion years is the widely accepted value by the scientific community.