
IN OCTOBER 2016, a row broke out over the age of asylum seekers entering the UK from France, with politicians and media commentators questioning why people admitted to the country as children seemed to look much older. Last week, press reports appeared to confirm those doubts: “Hundreds posing as child refugees shown to be adults,” ran one headline.
Such certainty might lead you to believe it is possible to work out precisely how old a person is – or at least to biologically tell the difference between an adult and a child. It isn’t.
“None of the age assessment methods is fit for purpose,” says at the University of Loughborough, UK. “They were never designed to give a person’s chronological age. There is no counter in the body that ticks up or down with age.”
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The headlines derive from a report for the UK’s Home Office, which states that between 1 July 2016 and 30 June 2017, there were 2952 unescorted children who claimed asylum in the UK. Of the 705 cases in which the Home Office disputed the person’s age, 618 were resolved, with 65 per cent judged to have been over 18.
“UK officials estimate the age of refugees merely from their appearance and demeanour”
Such decisions can determine the fate of those seeking asylum. The on the Rights of the Child states that refugees under the age of 18 must be provided protection and assistance by governments to enjoy their rights of identity, justice and education, among other things. Adults, meanwhile, may be detained or deported.
But making age assessments isn’t straightforward. In the UK, such judgements by the Home Office involve merely looking at someone, and estimating their age based on their appearance and demeanour. Many European countries use dental tests, bone X-rays and assessments of sexual maturity.
The Home Office declined to answer specific questions about how assessors make these decisions, but pointed to that recommend staff look at a person’s height, build, voice and facial features such as “skin lines” when estimating their age. Their mannerisms, eye contact and body language may also give away their age, says the document.
This isn’t far from arguing that many asylum seekers can’t possibly be children given their crow’s feet and grey hairs, and is on shaky scientific ground. “Height isn’t a particularly great measure,” says Tim Cole at UCL Great Ormond Street Institute of Child Health in London. “Girls reach their final height around the age of 16, and boys at 18, but there’s an enormous amount of variability.”
The same could be said of a teenager’s build and voice. The age at which a child reaches puberty can vary based on their ethnic background, genetics and experiences, says Judith Dennis of UK charity Refugee Council, who was consulted on the latest Home Office report.
“We get children that have lived in different climates, or might have health problems,” she says. “In a class of 14-year-olds, some will look like children, others will look much older.”
The traumatic events often experienced by children seeking asylum can affect not only the way they look, but their rate of biological ageing. Many will have witnessed war, famine and death. Some may have been directly involved in conflict, while others might be victims of sexual abuse.
Studies of US veterans who served in Iraq and Afghanistan have found that individuals who develop post-traumatic stress disorder , for example. Other studies have found that . And . All of this can make children look older than they are.
Dental tests
The latest version of the Home Office guidance on age assessments does at least warn that a person’s ethnicity and experiences might influence their appearance. “The guidance is better than it was,” says Kamena Dorling, who runs the . “But it’s fundamentally problematic to judge people as adults just by looking at them.”
There are also problems with other types of test. As of last year, , but not in the UK.
These work on the assumption that a person’s teeth mature at a typical rate. The third molars – or wisdom teeth – tend to reach their final stage of development after the age of 18, but they don’t always.
That means the tests aren’t foolproof, says Cole, and the error rates may depend on ethnicity. Dental tests will misclassify 10 per cent of European teenagers, but no one has looked at the error rates in people from Syria or Afghanistan, for example, he says. In tests of 15 to 20-year-olds of any ethnicity, “around a third of assessments will give the wrong answer”, estimates Cole.
The tests have been , but that hasn’t stopped .

Bone X-rays of the wrist are even more popular across Europe, being used by at least 24 countries to assess asylum-seeking children. These scans look at the finger, hand and wrist bones of young people and compare them to standard images of bone development to estimate their age.
“Generally, growth is finished by age 18 in girls and 21 in boys,” says Bogin. “But it can be finished by 15, and in others it might not be finished until age 30.” Despite this, teeth and bone tests have been used in to determine that three-quarters of asylum seekers whose child status was doubted and assessed are older than 18.
“Asylum seekers who claim to be under 18 but are later found to be adults may not even know their true age”
It is impossible to know if such tests can really determine a person’s age. What’s more, asylum seekers who claim to be under 18 but are later found to be adults may not even know their true age.
“It’s more complicated than just lying,” says Dorling. “In terms of the countries they’re coming from, they don’t automatically have birth certificates and there is not the same emphasis on birthdays.” UNICEF estimates that between 33 and 60 per cent of births are registered in , where .
Even the age someone becomes an adult is still being debated. “We use 18 as a cut-off, as if everything changes on your birthday, which is absurd,” says Dorling.
Our brains undergo changes in areas linked to problem solving and decision-making well into our 20s. A few months ago, a group of neuroscientists in Australia argued that .
Those arguments are based on the healthy development of typical teenagers. It is likely that many seeking asylum will have experienced trauma that may have delayed their cognitive development, says Bogin. “Trauma can slow everything down,” he says. “It may be that someone who has been traumatised will always need some help.”
While all of those contacted by 鶹ý agreed that there should be a distinction in the way children and adults are treated, Dorling wishes that governments provided support for young people who need it, even if they are over 18. “A person might be 19, but have all these vulnerabilities, and they need support – that’s the problem,” she says.
This article appeared in print under the headline “Age is just a number”