64. (1) When a youthful offender or child is detained in a certified institute or approved home, the managers of the institute or home may, at any time, with the consent in writing of the Chief Inspector, by licence, permit the youthful offender or child, on such conditions as may be prescribed, to live with any trustworthy and respectable person named in the licence willing to receive and take charge of him with a view to train him for some useful trade or calling. (2) Any licence so granted shall be in force until revoked or forfeited for the breach of any of the conditions on which it was granted. (3) The managers of the certified institute or approved home may, at any time by order in writing, revoke any such licence and order the youthful offender or child to return to the institute or home, as the case may be, and shall do so at the desire of the person to whom the youthful offender or child is licensed. (4) If the youthful offender or child refuses or fails to return to the certified institute or approved home, the managers of the institute, or home, as the case may be, may, if necessary, arrest him, or cause him to be arrested, and may take him, or cause him to be taken, back to the institute or home, as the case may be. (5) The time during which a youthful offender or child is absent from a certified institute or approved home in pursuance of a licence under this section shall be deemed to be part of the time of his detention in the institute or home, as the case may be: Provided that, when a youthful offender or child has failed to return to the institute or home, as the case may be, on the licence being revoked or forfeited, the time which elapses after his failure so to return shall be excluded in computing the time during which he is to be detained in the institute or home, as the case may be.