How old is the Earth?
Um, as old as dirt?
My actual answer is that the Earth is almost as old as the Sun, but not quite as old as Venus or Mars.
However, parts of the Earth, its gold and silver, platinum and uranium, are much older than the Sun. This is because these high-atomic-number elements were forged in stellar furnaces that predate even the beginning of our solar system.
Some of these parts may be twice as old as the beginning of the solar system, dating back as much as ten billion years.