What a difference a month makes: How weeks on the election campaign trail have aged party leaders by up to 30 YEARS

 According to Microsoft's new How Old app, which claims it can accurately guess a person's age from a picture, David Cameron has aged almost 30 years since the start of the election campaign. The app gave the Tory leader's age as 50 on March 30 (top left), despite his real age being 48, but after weeks of electioneering his age was estimated to be 79 on May 1 (bottom left). Youthful Ed Miliband, whose actual age is 45, was initially thought to be 30 on March 27 (second left top) but on May 1 was guessed to be 42 (second left bottom). A torrid month of campaigning which has barely seen the Lib Dems move in the polls has taken its toll on Nick Clegg, real age 48, who was estimated to be 43 on March 30 (second right top), but now looks 55 (second right bottom). Ukip leader Nigel Farage did not get off to the best of starts after his age was given as 65 on March 31 (top right) despite him only being 51, and things have gone from bad to worse after his age was thought to be 74 during a TV appearance yesterday (bottom right).