Picture taken on November 14, 2016 shows the supermoon rising above Cape Town. The moon will be the closest to Earth since 1948 at a distance of 356,509 kilometres (221,524 miles), creating what NASA described as "an extra-supermoon". / AFP PHOTO / RODGER BOSCH Washington: The moon is at least 4.51 billion years old — or 40-140 million years older than previously thought, says new…