Fermat lived almost three decades after he proposed his "Last Theorem" and was hardly inactive in that period. Indeed, just to clarify: The reason it is called

Fermat lived almost three decades after he proposed his "Last Theorem" and was hardly inactive in that period. Indeed, just to clarify: The reason it is called his "Last" theorem is that it was the last of his many claims to have been neither proven nor refuted; nothing to do with when he made the claim.