LONDON -- Long days spent on the campaign trail can take their toll on candidates, but how ageing are they?
We put photos of the UK's seven party leaders, mostly taken in the past week at various public appearances, through Microsoft's new age-guessing app "How Old Do I Look?"
All the leaders -- with the exception of Nigel Farage -- are in their 40s. Here's how they did:
Prime Minister David Cameron, Conservative Party
Real age: 48
Jacket off, top button undone, sleeves rolled up, it's "pumped up" Cameron. Apparently, this is a very ageing look for the current UK prime minister, adding a lot of years.
Ed Miliband, Labour Party
Real age: 45
Politics has been very generous to Miliband, it would seem, with the Labour leader shedding a whopping 16 years.
Nick Clegg, Liberal Democrats
Real age: 48
The past five years of being in a coalition with the Conservatives has had no negative (or positive) impact on Clegg's age.
Nicola Sturgeon, Scottish National Party
Real age: 44
The "Sturgeonator" has been on a gruelling schedule, whipping up the kind of support that's put her party on course for a landslide win north of the border -- as well as taking a selfie with almost every person in Scotland.
Nigel Farage, UK Independence Party
Real age: 51
UKIP leader Farage hasn't won or lost in the age stakes, apparently.
Natalie Bennett, Green Party of England and Wales
Real age: 49
The Green way of life is working out for Bennett, who dropped a decade, according to the app.
Leanne Wood, Plaid Cymru
Real age: 43
Like Clegg and Farage, the app was on the money with Wood.