Why can't you just check my age without checking who I am?
The fundamental issue is that most age-verification methods rely on data that is also personally identifying. A driver's license or passport proves your age, but it also proves your name, address, and photo — that's identity verification, not just age verification. As one analysis of online age verification efforts notes, true age verification should be 'the process of checking the age of an internet user, without necessarily verifying a person's identity' [2]. But in practice, the tools available today rarely achieve that separation.
Even advanced AI methods blur the line. A 2025 study on using AI for employee age verification through dental X-rays [1] found that deep learning models like ResNet and EfficientNet can estimate age with high accuracy. However, the method requires collecting a person's dental radiograph — a biometric identifier that is unique to that individual. So while the system's goal is age estimation, the data it collects is inherently identity-linked, making it impossible to verify age without also capturing identifiable information.
What happens when age-only methods aren't accurate enough?
When age-only methods are unreliable, companies fall back on full identity verification. A 2022 study on child face recognition [5] tested four top-performing systems (FaceNet, PFE, ArcFace, and a commercial system) on children aged 2–18 over an average of 3.35 years. When children wore face masks — a common real-world scenario — the systems' verification accuracy dropped by roughly 30% to 40%. That means nearly 1 in 3 attempts to verify a child's age by face would fail, pushing platforms to demand a government ID instead.
This accuracy gap is why age verification so often escalates. If a simple age-estimation tool (like analyzing a selfie) has a high error rate, especially for children or people wearing masks, the system's designers add more robust checks — which inevitably require identity documents. The 2023 EFF analysis [3] warns that this dynamic is already playing out in legislation like the UK's Online Safety Bill and U.S. age-verification proposals, where 'protect the children' measures end up requiring everyone to prove their identity, threatening anonymity and free speech.
Is there a way to verify age without revealing identity?
Yes, but it's not widely deployed yet. A 2022 framework using Self-Sovereign Identity (SSI) technology [4] shows a possible path: a person could hold a digital credential (like a 'verified over 18' token) on their own device and present only that proof to a website, without revealing their name or other details. The system uses blockchain and cryptography to make the credential fraud-proof while keeping the user's identity private. The study tested this approach for online loan processing and found it could replace the need for an intermediary (like a bank) that would normally see all your personal data.
However, this SSI approach is still a framework, not a widespread reality. The study [4] acknowledges that current document verification systems are 'overly complex and time-consuming,' and that interoperability between different SSI systems remains a challenge. Until such privacy-preserving age checks become the standard, the default will remain the blunt tool of identity verification — because it's the only method that currently works reliably at scale.
About These Sources
This answer is built on 5 peer-reviewed studies — published from 2022 to 2025, 2 from 2024 or later, 1 in Q1–Q2 journals — selected as the most relevant from 5 studies that passed quality screening, drawn from 44 papers retrieved from a database of over 500 million.
Sources used in this answer
The Role of Artificial Intelligence in Human Resource Management: Enhancing Employee Age Verification for Legal Compliance and Workforce Optimization
This 2025 study shows AI models (ResNet, VGG16, EfficientNet) can estimate age from dental X-rays with high accuracy, but the method inherently collects a biometric identifier (the dental radiograph), making it a de facto identity check.
Age verification: the complicated effort to protect youth online
This 2024 analysis explicitly defines age verification as 'checking the age of an internet user, without necessarily verifying a person's identity,' highlighting the gap between the ideal and current practice.
EFF Members' Speakeasy: When Child Safety Puts Us All at Risk
The 2023 EFF discussion warns that age verification proposals in the UK and US threaten anonymity and encryption, as they often require full identity verification under the guise of child safety.
A Framework for Online Document Verification Using Self-Sovereign Identity Technology
This 2022 study proposes a Self-Sovereign Identity (SSI) framework using blockchain and cryptography to verify documents (e.g., age) without revealing identity, but notes current systems remain complex and lack interoperability.
Longitudinal Analysis of Mask and No-Mask on Child Face Recognition
This 2022 study tested four face recognition systems on children (ages 2–18) and found accuracy dropped by approximately 30–40% when children wore masks, demonstrating why unreliable age-only methods lead to identity checks.