Worse. Google has to add this to all the machines in their data centers? Imagine the expansion of DevOps BS this will enable:
Vendors will need support stuff like "account holder is 12msec old, and can access adult content". They can even create a special certification for it.
useradd has the Other category at setup. Could you argue that anything which allows arbitrary text information to be input into a user account that could be passed on to other applications technically fulfills the requirement, as the user could indicate age on the account?