This is a true pedant's post, but I think it's an interesting point all the same. In an article at Little Atoms the other day, Mike Harris made the following claim, which is technically accurate but gives a misleading impression -
"The average Briton is 40 years old, with 1997 the first general election in which they voted. They simply do not remember or care about the Militant Tendency or the Bennites."
Meanwhile, in an article in the New Statesman, Stephen Bush made the same point in a way that veered into inaccuracy -
"The average voter cast their first ballot in 1997. For Labour Party members, it is Labour victory rather than Conservative hegemony that has become the default setting of British politics."
The problem is that although the average person in Britain is 40 years old, you have to factor in children (who are too young to vote) to arrive at that average. The average person of voting age is actually in their late 40s, and probably cast their first general election ballot in 1987, just two years after Neil Kinnock declared war on Militant. When you take into account the fact that older people are considerably more likely to turn out to vote, it must be the case that the authentic average voter is well over 50 years old, and first took part in a general election in 1983 or possibly even 1979.
So if Corbyn becomes leader, the majority of people who cast the first popular verdict on him next May in the devolved and local elections will have voting age memory of the last time the Labour left were in the ascendancy. I'm not sure what that means in practical terms, but I thought it was worth pointing out.