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Yeah, I was reading 'aftermath' in a fairly loose way there.
I understand the split (I should find wherever it was mentioned before) as to do with 'proximity' to the war, I guess. So the noticeable shift towards Remain starting with the youngest people who would have remembered rebuilding and the social mood of the 1950s, perhaps the people whose parents/upbringing gave them the context even if they didn't themselves remember the founding of the NHS for example (almost 70 years ago) - and then increasing in proportion the older you get, as you get more direct memories across more of the population. Remembering the war itself, directly, has a fairly distinct age range, but the 'aftermath' gives you the younger age group, and that's much more variable. (Rationing ended from the late-40s to the mid-50s depending on what is was - people in mid-late 6os could remember it, but I had really just interpreted aftermath less literally...)
Nope. People who are 70 were born just after the war so. Their earliest memories would be from the early 50s. I have no point of reference for the UK but my assumption is that by the early 50s a lot of the rebuilding would have been underway/mostly finished. Rationing would have ended by then too (I think)