I am betting that I could just return “18+” and be correct more than 90% of the time:

A contract tender … “Home Office are seeking to procure an algorithm that can accurately predict the age of a subject,” the contract’s description reads. “This will have multiple use cases for Home Office, an example could/would be to assist in determining the age of those who are encountered without verifiable identity documentation.”

https://www.theregister.com/2025/09/09/home_office_age_algorithm/