AN ACT LOWERING THE COMPULSORY AND OPTIONAL RETIREMENT AGE OF GOVERNMENT EMPLOYEES AT FIFTY-FIVE YEARS OF AGE, AND FIFTY-YEARS OF AGE RESPECTIVELY, AMENDING FOR THE PURPOSE PRESIDENTIAL DECREE NUMBERED ELEVEN HUNDRED AND FORTY-SIX, OTHERWISE KNOWN AS THE 'REVISED GOVERNMENT SERVICE INSURANCE ACT OF NINETEEN HUNDRED AND SEVENTY-SEVEN