(Part of the biometric product marketing expert series)
Two Biometric Update stories that were published on March 27, 2025 reminded me of something I wrote before.
An announcement from Paravision says its biometric age estimation technology has achieved Level 3 certification from the Age Check Certification Scheme (ACCS), the leading independent certification body for age estimation. The results make it one of only six companies globally to receive ACCS’s highest-level designation for compliance.
San Francisco-based Paravision’s age estimation tech posted 100 percent precision in Challenge 25 compliance, with 0 subjects falsely identified as over 25 years old. It also scored a 0 percent Failure to Acquire Rate, meaning that every image submitted for analysis returned a result. Mean Absolute Error (MAE) was 1.37 years, with Standard Deviation of 1.17.
Now this is an impressive achievement, and Paravision is a quality company, and Joey Pritikin is a quality biometric executive, but…well, let me share the other story first, involving a Yoti customer (not Yoti).
Fenix responded that it set a challenge threshold at 23 years of age. Any user estimated to be that age or younger based on their face biometrics is required to use a secondary method for age verification.
Fenix had set OnlyFans challenge age, it turns out, at 20 years old. A correction to 23 years old was carried out on January 16, and then Fenix changed it again three days later, to 21 years old, Ofcom says.
Now Biometric Update was very clear that “Yoti provides the tech, but does not set the threshold.”
Challenge ages and legal ages
But do challenge thresholds have any meaning? I addressed that issue back in May 2024.
Many of the tests used a “Challenge-T” policy, such as “Challenge 25.” In other words, the test doesn’t estimate whether a person IS a particular age, but whether a person is WELL ABOVE a particular age….
So if you have to be 21 to access a good or service, the algorithm doesn’t estimate if you are over 21. Instead, it estimates whether you are over 25. If the algorithm thinks you’re over 25, you’re good to go. If it thinks you’re 24, pull out your ID card.
And if you want to be more accurate, raise the challenge age from 25 to 28.
NIST admits that this procedure results in a “tradeoff between protecting young people and inconveniencing older subjects” (where “older” is someone who is above the legal age but below the challenge age).
You may be asking why the algorithms have to set a challenge age above the lawful age, thus inconveniencing people above the lawful age but below the challenge age.
The reason is simple.
Age estimation is not all that accurate.
I mean, it’s accurate enough if I (a person well above the age of 21 years) must indicate whether I’m old enough to drink, but it’s not sufficiently accurate for a drinker on their 21st birthday (in the U.S.), or a 13 year old getting their first social media account (where lawful).
If you have a government issued ID, age verification based upon that ID is a much better (albeit less convenient) solution.
(Kid computer picture by Adrian Pingstone – Transferred from en.wikipedia, Public Domain, https://commons.wikimedia.org/w/index.php?curid=112727.)
(Fake driver license picture from https://www.etsy.com/listing/1511398513/editable-little-drivers-license.)
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