https://www.vice.com/en_us/article/z3bxdj/the-oldest-material-discovered-on-earth-is-7-billion-year-old-literal-stardust

Scientists have identified the oldest material ever found on Earth inside a space rock that crashed into Australia more than a half-century ago.

The meteorite is filled with tiny grains of ancient stardust that predate the birth of the Sun and our solar system by more than two billion years, according to a study published on Monday in Proceedings of the National Academy of Sciences.