Ensure system does not have this information:

    loginctl show-user $USER 2>/dev/null
    userdbctl user $USER --json=pretty 2>/dev/null | grep -i birth

Confirm field is not set

    homectl inspect $USER | grep -i birth

If it is set, unset it

    sudo homectl update $USER --birthday=""

Tell your favorite AI what OS, kernel version (matters if using a locked down kernel) and browser is being used. Ask for a systemd service that uses bubblewrap to prevent access to systemd, set whatever other limits like memory and CPU usage.

If in the future the browser gets passive / aggressive updates if they mimic Microsoft and refuses to run if there is no age set or if they can not call systemd commands or libraries then script a random age or age range on each login so that it is not used for tracking. pseudo super-cookie