These models are discriminatory for a lot of people, I'd say, and shouldn't be allowed.
The practical problems are all caused by AI companies lying through their teeth and making bold claims and their customers being dumb enough to believe them.
The actual problem that needs solving is the fact that you need to validate your age without a form of solid proof being available in the first place. In cases where everyone has digital ID already there are technical solutions to solve that problem, and until those are available for free, it's idiotic to require the use of such technology in the first place. The UK doesn't have common, accessible digital ID yet they expect digital identification of some kind to just happen.