As Guido revealed in yesterday’s Sun column, there is some truth to the much-levelled charge that Downing Street is overrun with “kids”. The PM’s team is smaller and younger than at any point in the last ten years. The Prime Minister’s Office currently employs 181 staffers, almost 50 fewer than at the peak of Tony Blair’s government. Their average age is 39, lower than any point in the last ten years other than 2004/5, when it was the same. And they’ve been getting younger since Dave took office…