sentences:  The oldest Moon rocks are up to 4.5 billion years old, making them 200 million years older than the oldest Earth rocks, which are from the Hadean eon and dated 3.8 to 4.3 billion years ago.The rocks returned by Apollo are very close in composition to the samples returned by the independent Soviet Luna programme.A rock brought back by Apollo 17 was dated to be 4.417 billion years old, with a margin of error of plus or minus 6 million years.