My Dad is 83, and my mother is 73 (divorced). I've asked them, and they both do not have wills, and in fact refuse to make wills, saying they "don't have any money so it doesn't matter".
My father did buy a cemetery plot for him and my mother and he has created an a medical advanced directive (no treatments), but other than that nothing is written down and we don't know what their preferences are, or even how to pay bills if there is a hospitalization, anything. It will be a big mess, especially as two of my siblings live in mother's house...
So, it could be worse.