They're putting in the initial work of age verification beginning with an age field.

Install Guix System. It uses GNU Shepherd as its init system. 😃

Have you read more than the headline? It's just an entry in a local system file. There is no enforcing and actually ties in nicely with something like parental controls. Which is, as luck would have it, responsible parents want.

Without knowing what distro you're on, it probably involves switching distros.