def METHOD_NAME(self, config: JsonDict, **kwargs: Any) -> None:
    """Parses the old account validity config. The config format looks like this:
    account_validity:
        enabled: true
        period: 6w
        renew_at: 1w
        renew_email_subject: "Renew your %(app)s account"
        template_dir: "res/templates"
        account_renewed_html_path: "account_renewed.html"
        invalid_token_html_path: "invalid_token.html"
    We expect admins to use modules for this feature (which is why it doesn't appear
    in the sample config file), but we want to keep support for it around for a bit
    for backwards compatibility.
    """
    account_validity_config = config.get("account_validity") or {}
    self.account_validity_enabled = account_validity_config.get("enabled", False)
    self.account_validity_renew_by_email_enabled = (
        "renew_at" in account_validity_config
    )
    if self.account_validity_enabled:
        if "period" in account_validity_config:
            self.account_validity_period = self.parse_duration(
                account_validity_config["period"]
            )
        else:
            raise ConfigError("'period' is required when using account validity")
        if "renew_at" in account_validity_config:
            self.account_validity_renew_at = self.parse_duration(
                account_validity_config["renew_at"]
            )
        if "renew_email_subject" in account_validity_config:
            self.account_validity_renew_email_subject = account_validity_config[
                "renew_email_subject"
            ]
        else:
            self.account_validity_renew_email_subject = "Renew your %(app)s account"
        self.account_validity_startup_job_max_delta = (
            self.account_validity_period * 10.0 / 100.0
        )
    # Load account validity templates.
    account_validity_template_dir = account_validity_config.get("template_dir")
    if account_validity_template_dir is not None:
        logger.warning(LEGACY_TEMPLATE_DIR_WARNING)
    account_renewed_template_filename = account_validity_config.get(
        "account_renewed_html_path", "account_renewed.html"
    )
    invalid_token_template_filename = account_validity_config.get(
        "invalid_token_html_path", "invalid_token.html"
    )
    # Read and store template content
    custom_template_directories = (
        self.root.server.custom_template_directory,
        account_validity_template_dir,
    )
    (
        self.account_validity_account_renewed_template,
        self.account_validity_account_previously_renewed_template,
        self.account_validity_invalid_token_template,
    ) = self.read_templates(
        [
            account_renewed_template_filename,
            "account_previously_renewed.html",
            invalid_token_template_filename,
        ],
        (td for td in custom_template_directories if td),
    )