16 Communication 71/92 Rencontre Africaine pour la defense des droits de l'homme/Zambia; Communication 159/96 UIDH et al./Angola. 17 Human Rights Committee, General Comment 25 (57), adopted by the Committee at its 1501th meeting, UN Doc. CCPR/C/21/Rev. 1/Add. 7 (1996), para. 4 × 4. Any conditions which apply to the exercise of the rights protected by article 25 should be based on objective and reasonable criteria. For example, it may be reasonable to require a higher age for election or appointment to particular offices than for exercising the right to vote, which should be available to every adult citizen. The exercise of these rights by citizens may not be suspended or excluded except on grounds which are established by law and which are objective and reasonable. For example, established mental incapacity may be a ground for denying a person the right to vote or to hold office. . 10