Yes, that is definitely one way we could do it. Oldest citizen, or citizen with the longest citizenship, or any number of ways.
Practical problems with longest citizenship have already been pointed out, and of course if we went with the oldest citizen, it could be someone who had only been a citizen for a week. More importantly, there's just no reason to think either of these traits will result in a good choice.
In my personal opinion, I think that the king should nominate someone and then that should be democratically confirmed. I proposed confirmation by plebiscite, but maybe it should be a two-step process where the king proposes a nominee that must be confirmed by the Ziu before going to the people.
Practical problems with longest citizenship have already been pointed out, and of course if we went with the oldest citizen, it could be someone who had only been a citizen for a week. More importantly, there's just no reason to think either of these traits will result in a good choice.
In my personal opinion, I think that the king should nominate someone and then that should be democratically confirmed. I proposed confirmation by plebiscite, but maybe it should be a two-step process where the king proposes a nominee that must be confirmed by the Ziu before going to the people.