The Earth is an estimated 4.54 billion years old; there's an old rock in Australia that's 4.4 billion years old!

The rock was discovered nearly 30 years ago, and is known as the oldest known rock on Earth. Investigation of the ancient crystals in the rock reveal that the new planet already had oceans and may have had life on it back then. It's possible that in its earlier history, Earth saw oceans appear and disappear, along with early life forms that evolved and were wiped out in those turbulent times. If you're a classic rock fan then i believe that this is the most classic you can get!