The Moon is about 4.5 billion years old. Most estimates put it in the range of 4.35 to 4.51 billion years , depending on the study and how its formation is dated.

Quick Scoop

  • A commonly cited age is about 4.46 billion years.
  • Some newer research suggests it could be closer to 4.51 billion years.
  • Older estimates around 4.35 billion years still appear in recent discussions, so the exact number is not fully settled.

Simple takeaway

If you just want one number, “about 4.5 billion years old” is the best approximate answer.