The Home Office has published detailed guidance on its planned use of facial age estimation (FAE) technology to support initial age decisions for asylum seekers, days after more than 60 human rights organisations wrote to border security and asylum minister Alex Norris demanding the government halt the rollout, branding the tool biased, inaccurate and potentially unlawful.
The guidance, published 29 May 2026, sets out how FAE will work when introduced at the border from 2027. The technology uses machine learning to estimate a person's age from a facial photograph within seconds, trained on large datasets of images with known ages. The Home Office is explicit that FAE will not automate or replace human decision-making: immigration officers will remain responsible for initial age decisions, using FAE estimates alongside appearance, demeanour and, where relevant, the views of social workers.
The guidance distinguishes FAE from facial recognition, noting the former does not identify individuals or search any database, and stresses that under current policy any person whose age is disputed but who does not appear "significantly over 18" to two independently assessing officers continues to receive the benefit of the doubt and is treated as a child pending a fuller, Merton-compliant assessment.
The guidance also published performance data from the US National Institute of Standards and Technology, which has tested FAE algorithms since 2014 on a dataset of around 11 million images. It acknowledged that "FAE performance can vary depending on ethnicity, skin tone, gender, place of birth and quality of input image," that error rates are almost always higher for female faces, and that even top-performing systems carry an error margin of around 2.5 years at the critical 16-to-18 boundary.
In an open letter to Norris, 62 organisations - including Amnesty International, Human Rights Watch, Liberty, the Electronic Frontier Foundation, Foxglove and the Open Rights Group - argue the Home Office's own guidance undermines confidence in the tool, given that asylum-seeking children are predominantly people of colour and FAE is reported to perform best on Eastern European men.
The groups warn of "baked-in failures and discrimination" and argue the Home Office has focused public messaging on adults wrongly claiming to be children while underplaying the greater risk that genuine children could be misclassified as adults, with consequences including placement in adult accommodation, detention or removal.
The letter gives the Home Office 21 days to answer questions on testing methodology, training data provenance and consent, equality and data protection impact assessments, the stages of the asylum process at which FAE results will be used, and what appeal mechanisms will be available to those challenging an estimate.
The groups also raise the unresolved question of how lawful consent could have been obtained to collect or process data from asylum-seeking children to train commercial FAE systems, and highlight that trauma, malnutrition and the physical toll of dangerous journeys may cause premature facial ageing not accounted for in standard training data.
The Home Office insists that FAE is a "supplementary tool" subject to human oversight but the campaigners claim that that documented automation bias means officers are likely to defer to algorithmic estimates in practice, with one rights researcher quoted elsewhere describing the planned deployment as a "world-first" that could set a precedent for other European border authorities.
