Stars that can produce elements up to iron and spread it through a supernova are massive and have relatively short lifespans of 10-30 million years. Since the U

Stars that can produce elements up to iron and spread it through a supernova are massive and have relatively short lifespans of 10-30 million years. Since the Universe is 14 billion years old, we have had already more than a hundred generations of such stars before a 10-billion years-old planet has formed, so the necessary elements are probably there.