def max_age(self):
        """Gets the max_age of this Params.

        Maximum age (in hours) for the repo to be considered.
        Any repo tested or being tested after \"now - max_age\" will be taken
        into account. If set to 0, all repos will be considered.

        :return: The max_age of this Params.
        :rtype: int
        """
        return self._max_age