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Computer tests carried out by Express.co.uk concluded most of the youngsters who came to the UK yesterday look around 25 on average - around decade older than their given ages. The results come as a Home Office official addressed the growing questions surrounding how old the children really are by saying they had physically matured quickly because of the horrors they had witnessed in war.

REUTERS/GETTY The first batch of child refugees from Calais have arrived in Britain

According to the analysis carried out by this website just one of the refugees plucked out of the crime-ridden Jungle camp looks like a teenager, whilst most resemble adults in their late twenties to early thirties. Politicians have raised concerns over photographs of the "hulking" children, some of whom clearly have facial hair, and warned Britain's generous hospitality must not be abused by economic migrants posing as minors.

GETTY Some politicians have raised questions over the ages of the youngsters

REUTERS Express.co.uk ran their photographs through a face recognition website

REUTERS The website, which is not always accurate, returned an average age of 25

Tory MP for Monmouth, David Davies, said the new arrivals "don't look like ‘children’ to me" whilst Ukip MEP Jane Collins said it was a common tactic for migrants to claim they were much younger than they are, adding the 'child' refugees "looked very mature for their age". To test out their claims Express.co.uk ran photographs of 11 of the child refugees who were snapped as they arrived in Britain yesterday through the How-Old.net calculator. The facial recognition site, which judges people's ages by analysing their facial features using complicated algorithms, was set up by computer boffins at Microsoft. It was developed by experts at the computer giant to advance the use of facial recognition software in a variety of fields, including as a security feature to authorise bank transactions. The site carries the disclaimer its findings are not always accurate, and that they are only designed to indicate how old somebody looks - not to give their actual age. And a spokesman for Microsoft today insisted: “How-old.net was designed to be an example of how developers could build a fun app using modern development practices. It is not intended to be used as a definitive assessment of age.”

REUTERS However, a Home Office spokesman said they had been aged by the horrors of war

REUTERS Tory MP David Davies said the refugees did 'not look like children'

REUTERS The Monmouth MP described the youngsters as 'hulking'

When express.co.uk ran photographs of five of our reporters through the system, who were all men aged between 28 and 34, its results were accurate to within two years in all but one instance. However, when the site was asked to judge the ages of five 17-year-old celebrities plucked from the Internet it performed less well. In one instance it gave an age of 27 for Brooklyn Beckham, the son of former England footballer David. However, its findings will still add to the debate over Britain's border checks after it emerged immigration officials have no way of verifying the ages of refugees who claim they are children, but who do not have papers. A Home Office spokesman admitted the youngsters had not been subjected to any medical tests, such as dental examinations, which could prove their ages because they would be "intrusive".

GETTY But immigration officials insist they are all between the ages of 14 and 17

REUTERS Around 300 migrant children are expected to come to Britain from the Jungle in Calais

REUTERS The camp is set to be razed by the French authorities

These don't look like ‘children’ to me. I hope British hospitality is not being abused Tory MP David Davies

He added the children may look older than their typical British counterparts because fleeing war zones had "probably toughened them up so they've grown up a bit quicker". In instances where refuges have no official documentation, Home Office protocol states a screening officer can certify them as a child based on their “physical appearance” or “demeanour”. And after seeing their pictures, MP Mr Davies said: “These don't look like ‘children’ to me. I hope British hospitality is not being abused. “They are hulking teenagers who look older than 18. I'm all for helping the genuine children but the well of goodwill is rapidly being exhausted here.

REUTERS Charities have warned children are especially vulnerable whilst it is dismantled

REUTERS But questions have been raised why the UK has not taken in younger children, or any girls

He added: "I'm also curious there are no young women - I would have thought they would be much more vulnerable. I worry that once again British hospitality is being abused. “There is no way of knowing if someone is a child. We could end up causing even more misery if we are not careful. We should invite anyone who wants to come to the UK to take dental tests." And Ukip MEP Jane Collins said the children added she too “hoped the British public weren’t providing refuge for adult economic migrants trying to pull a fast one". She said: “I have been told by social workers there are many cases of transparently adult migrants claiming to be under 16 and the social work teams have to go on what these ‘children’ say unless it can be proved otherwise with full access to the social security system here in the UK. “Many of the migrants in Calais threw away their documentation because then they are unable, under international law, to be returned to a country if they are technically ‘stateless’ or it cannot be proved where they came from."

The hardships of migrant life Thu, March 10, 2016 The hardships and heart-wrenching pictures of migrant life across the globe, including Greek-Macedonian border conditions and Calais migrant conditions. Play slideshow Getty 1 of 53 The hardships of migrant life