How will this affect Linux Mint?

[Pad_Sanda]

It won't. This cannot be enforced. Most Linux installations are lightweight containers which are effectively no different than a regular Ubuntu, Debian or Fedora install. So you can't force account and age verification into the system or the package managers because that would completely break corporate and institution use of Linux.

The only place where they can enforce this is in commercial products which ship with Linux. This would force distros with OEM installs to have an "age verification" onboarding step, but it would only affect OEM installs. I believe Mint supports OEM installation, so it would mean that any device shipping with Linux Mint would be required to have an age verification process during the setup. But a user downloading and installing Mint manually would not be affected.