comparable jurisdiction in a common law country, in each case for not less than five years, or if he or she has practised as a legal practitioner before a court having unlimited jurisdiction in civil and criminal matters in a common law country for not less than five years. (5) In this section, :common law country” means(a) (b) Vacancy in office of 140. Chief Justice In the event of there being a vacancy in the office of the Chief Justice, or if he or she is, for any reason unable to perform the functions of his or her office, the President may appoint the most senior judge of the Supreme Court to act in that office(a) (b) Tenure of office 141. of judges a country within the Commonwealth; or a country outside the Commonwealth prescribed by an Act of the National Assembly for the purposes of this Assembly for the purposes of this section the courts of which exercise a common law jurisdiction. until a person has been substantively appointed to, and assumed the functions of that office; or until the Chief Justice has resumed the functions of his or her office, as the case may be. A vacancy in the office of chief justice shall be filled by a substantive appointment within six months. (1) No office of judge shall be abolished while there is a substantive holder thereto. (2) Subject to the provisions of this section, a judge of a Superior Court(a) (b) (c) (3) may retire on pension at any time after attaining the age of sixty five years; shall vacate the office of judge on attaining the age of seventy years; or may have his or her appointment terminated by the President in consultation with the Judicial Service Commission. Notwithstanding that he or she has attained the age at which he or she is required to vacate his or her office as provided in this section, a person holding the office of judge may continue in office for a