At 4.57 billion years old, the Allende meteorite is the oldest known natural specimen on Earth. Published November 30, 2009 at 216 × 140 in At 4.57 billion years old, the Allende meteorite is the oldest known natural specimen on Earth. At 4.57 billion years old, the Allende meteorite is the oldest known natural specimen on Earth. At 4.57 billion years old, the Allende meteorite is the oldest known natural specimen on Earth.