Do we have ever younger Prime Ministers?

With Vince Cable’s recent interview comments reviving chatter over how old is too old to be an aspirant party leader and Prime Minister, what does the actual age profiles of our Prime Ministers look like?

Here are all our Premiers from this century and the last, showing at what age they first went into 10 Downing Street and at what age they exited it for the last time.

If anything, until the middle of the last century Prime Ministers were getting older. The story since, however, is very different.

UPDATE: The irony of Vince Cable making these comments is that several years later and older, he decided he was not too old to aim to be party leader and plausible Prime Minister himself.