The earliest galaxies formed when the universe was just a few hundred million years old, which means there may have been planets that are 3x times older than Earth.
Several caveats apply, chiefly that heavy elements weren't produced for a while in significant quantity, but were produced fairly early on due to large stars exploding relatively quickly, when they were merely tens of millions of years old, if that.
Several caveats apply, chiefly that heavy elements weren't produced for a while in significant quantity, but were produced fairly early on due to large stars exploding relatively quickly, when they were merely tens of millions of years old, if that.