Section 176(1) of the Constitution requires that an Act of Parliament itself must extend the term of office of a Constitutional Court judge. This power cannot be delegated to the Executive. The language "Act of Parliament extends" is a strong textual indicator that Parliament must take the legally significant step of extending the term and may not surrender this legislative power in favour of executive discretion. The power to extend judicial tenure goes to the core of judicial independence and the separation of powers, and is not a matter of minor regulatory detail that may be delegated. Section 8(a) impermissibly granted the President unfettered discretion to decide whether to extend the Chief Justice's term and for what period, without adequate legislative guidelines. This constituted an unlawful delegation of plenary legislative power, not merely a discretion to implement legislation. Further, section 176(1) does not permit Parliament to single out the Chief Justice for differential treatment in extending terms of office. While the Constitution creates distinctive offices of Chief Justice and Deputy Chief Justice for appointment purposes, section 176(1) refers indifferently to "a Constitutional Court judge" and makes no mention of the Chief Justice. In performing judicial functions, all Constitutional Court judges are equal, and incumbency of the office of Chief Justice does not create a special entitlement to extension. Any extension must apply indifferently to all Constitutional Court judges based on objective criteria such as age or years of judicial service, not on incumbency of a particular office.