Original: Zircons from Jack Hills in the Narryer Gneiss Terrane , Yilgarn Craton , Western Australia , have yielded U-Pb ages up to 4.404 billion years , interpreted to be the age of crystallization , making them the oldest minerals so far dated on Earth .
Simplified: This is judged to be the age of crystallization , making them the oldest minerals so far dated on Earth .