(1) No person under the age of eighteen years shall hold, or be granted, a conductor's licence.
     (2) The licensing authority may refuse to issue a conductor's licence--
         (a) if the applicant does not possess the minimum educational qualification;
         (b) if the medical certificate produced by the applicant discloses that he is physically unfit to act as a conductor; and
         (c) if any previous conductor's licence held by the applicant was revoked.