It has been a tough month in the general election campaign.
But while David Cameron and the other party leaders said they would do whatever it takes, they might not have been prepared for the results.
For, according to a new app, the politicians have all aged by nearly 30 years.
How Old allows people to upload photos and then provides an age and gender.
The system works by analysing 27 points on the face, Microsoft said.
These 'landmarks' include the pupils, canthus (the corner of the eye) and the nose, which change gradually as we age.
MailOnline used the application to compare photographs of the party leaders at the end of March to ones from the end of this week.
The Prime Minister, 48, showed the biggest change. The app guessed he was 50 years old a month ago - but added an extra 29 years to the Tory leader when analysing a picture taken yesterday.
One explanation could be that the Conservative leader's hair is now significantly greyer.
Amazingly Ed Miliband was given the age of 30 at the end of March despite actually being 45.
The app increased the Labour leader's age to 42 following a tough election campaign.
A spokesman for Microsoft added: 'These attributes are predicted by using statistical algorithms and may not always be 100% precise.'