Vinyl I agree with your second point, but in regards to my elderly people comment I meant that a good proportion (I think the majority) of very elderly people would not want to be first in the queue/receive a vaccine over and above younger people, which after all would include their children and grandchildren. It doesn't matter that they know their risk of dying is much higher, surely? I know that as a CEV person my risk of dying is much higher and I would still much prefer younger people to receive the vaccine before me.
This is why the advance care plans are so important, so you can state your own decisions instead of someone deciding what you want, for you.
Decisions will be taken at a population level and I agree with this as the thread shows (very clearly!) the unedifying spectacle of people with their elbows out and their own scale of worthiness in their heads.
Still though we should have some agency over own care and even though a medical intervention has been deemed suitable by professionals (eg whether we should be given a vaccine, or CPR etc etc) the final decision to accept this offered intervention should be up to the individual. I think the reality is that if everyone had an Advance Care Plan, a lot of the decisions having to be made now, would be a lot easier.
(Now obviously, before anyone starts, I am not advocating euthanasia etc). I just genuinely believe that we are extending some peoples lives and care beyond the point they would wish us to and that they may make different choices. Reading this thread is bad enough as a CEV person, I don't want (some) posters like these, who display such shit critical thinking and prejudice, making decisions for my health and life thank you.
Advance Care Plans are so important as your wishes should be respected as to whether you want to accept any medical interventions or care offered. A lot of these scenarios and lives being discussed here would be moot for a start, and people could put away their Scales Of Worthiness 
(I'm amazed no one has said that within the over 80s some may be retired teachers and should go first before the other non teacher 80 year olds
)!