@Alan McDougall,
:detective: Oh hi! This is a difficult subject. I think the living beings over the edge of normal expectancy should be able to live near their original species and live closer to their most likely places. From that special places, the living beings should be able to exchange their physical and mental physical and attributes with their old and new cultures. When that living beings is ready, the living beings will automatically be send to the particular area of the living beings' perferable choice. :sarcastic:
Old healthy people usually will chose their own leader, if the leader is missing. If they don't have anyone, distract them with a made up concept for the people to be sort of like short lives. Only when all of the people wants to be better, then can they be immortals.
Anything beyond the total label of the word, "sex", when appeared by nuclear difference, is not "sex". "Sex" can never work in immortals' eyes, however there is a strict bioethics for "sex".