Section 4: Subject lo the provisions of section 3 the Director of

Audit shall hold office until he attains the age of fifty-five years: Provided that he may at any time after giving siX months notice in writing addressed to the Governor-General (or such shorter period of notice as the Governor-General may accept) retire from office and be granted a pension (a) on or after attaining the age of forty-five years; (b) in the case of transfer to other public service (as defined in section 2 of the Pensions Act) on or after attaining the age at which he is permitted by the law or rules of the public service in which he is last employed to retire on pension or gratuity; or (c) if the Chief Medical Officer certifies that he is incapable by reason of any infirmity of mind or body of disçharging the duties of his office and that such infrmity is likely to be permanent.