YOVUYIBOR and ANOTHER v ATTORNEY- GENERAL and ANOTHER    Constitutional law—Public service—Public officers—Retiring age—Constitution, 1992 providing for compulsory retirement of public officers on attainment of age of 60 years—Police Service listed as part of public services under article 199(1) of Constitution—Constitution providing in section 8(1) of transitional provisions that persons holding or acting in offices in existence before the coming into force of Constitution to hold or act in equivalent offices as far as was consistent with Constitution—Constitution also providing in section 8(2) of transitional provisions that officers required under existing law to vacate office at "expiration of a period of service" to vacate office at expiration of period—Meaning and effect of section 8(1) and (2) of transitional provisions —Plaintiffs, both police officers, compulsorily retired from Police Service after the coming into force of constitution, 1992 at age of 55 years—Whether purported retirement of plaintiffs valid—Constitution, 1992, art 199(1) and Sched 1, s 8(2).