I think the division was between the educated and non-educated (i.e. early school leavers). As the school leaving age has risen over the past few decades, that

I think the division was between the educated and non-educated (i.e. early school leavers). As the school leaving age has risen over the past few decades, that happened to track with age. In other words, Brexit voters were what you could diplomatically call "low information voters" (I'd call them "thick racist dipshits" but that's probably why I'm not a politician). Another factor is that the core Brexit (and Conservative) voters are retired home-owners, who are less directly connected to the productive side of the economy. The media they consume keeps them in that fantasy bubble. Take the Daily Express for example, which has reality-defying headlines that would put the North Korean Ministry of Information to shame. So other than some clues (rising prices that can be blamed on global conditions, longer queues at airports that can be blamed on staff shortages and so on) they probably believe Brexit is going just fine.