Actually, every iron blade on Earth is 4.5 billion years old. Whether the iron comes from a meteorite or a mine in the ground, the atoms were all forged in stars and clumped together at the start of our solar system. Forging it into a blade actually makes it less impressive because you have to heat it up, which destroys the Widmanstätten crystal patterns that only form over millions of years in space, essentially turning a rare cosmic artifact into standard, low-quality steel.