In the 2016 referendum, broadly speaking the older generation voted Leave while the younger generation voted Remain
With Covid, the older generation are at greater risk of becoming seriously ill while the young are at lower health risk
The old may be retired or are much less likely to work in shops or the hospitality industry - jobs which often rely on the young to provide cheap labour and whose economic circumstances are more precarious due to lower levels of savings
Self interest alone suggests a likely correlation between Brexit and favouring lockdiwn