https://www.vice.com/en_us/article/dy357q/an-ancient-space-crystal-may-have-just-rewritten-the-history-of-the-moon

In a revelation that could rewrite the early history of the Moon, a team of scientists have determined that the Moon is about 40 million years older than previously known by studying ancient crystals brought back to Earth by the crew of Apollo 17 half a century ago, according to a new study. 

The team determined that a grain of lunar zircon crystals from the Apollo 17 landing site is 4.46 billion years old. This timeline fits well with earlier predictions about the formation of the Moon, but the study offers new empirical proof that the Moon has been at Earth’s side—and indeed, was likely once a part of it—for almost all of the solar system’s history.