Maybe Henry’s sixth wife survived him just because he was already quite old! But that is nothing more than my assumption. Catherine Parr was very smart and knew how to manage her husband, just like any other woman can only wish to. Henry’s violent temper did not get better as he aged, so Catherine had to adjust. She did it extremely well. She did not just survive him, but also managed to be on a very friendly foot with his daughters.
Catherine and Henry did not have common children, but the Tudor dynasty did not fade with Henry’s death. Elizabeth – the unwanted daughter of Anne Boleyn, the former bastard – became THE QUEEN, any country can only dream of. And, in spite of what Henry desired, she was a woman!