<sod >Still a month off his fiftieth birthday, the youngest ex-Prime Minister since the nineteenth century, he ha also smashedÂ a two hundred year old record.< eod>< sod > Still a month off his 50th birthday, the youngest ex-Prime Minister since the 19th century, he has also smashedÂ a two 200-year-old record:Â to be in and out of both the Commons and No 10 in 15Â years is the fastest anyone has ever managed it.< eod>