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My current assumptions are based on turnout in the age brackets not changing (i.e older voters more likely to turn out still) but the % split of the vote staying the same (so an 18 year old now in 75% likely to vote in, that % will stay despite their age changing)
I'm sure there's more data to improve the model later, and I should stick it into R, but at the moment, I'm just playing with Google Sheets.
You need to factor in elderly voters moving to the right and others moving to the left in the face of growing racism on their high streets.