A Younger Moon

New analyses of lunar rocks suggest the Moon was formed 100 million years later than thought, or roughly 4.45 billion years ago.

Current theory holds that the Moon was created as a result of a Mars-sized body slamming into the young Earth, throwing material into space that coalesced into the Moon.  In fact, there is geologic evidence that Earth suffered a major catastrophe about 4.4 billion years ago.