(i) For each full year of covered employment occurring prior to January first, nineteen hundred seventy-one, his or her normal retirement age shall be reduced by six months; and
(ii) For each full year of covered employment occurring prior to January first, two thousand nine which is subsequent to December thirty-first, nineteen hundred seventy, his or her normal retirement age shall be reduced by four months. b. Provided however, that nothing herein:
(i) Shall permit a member of Tier one to retire, other than for disability, prior to the attainment of age fifty, or a member of Tier two, three or four to retire, other than for disability, prior to the attainment of age fifty-five; and
(ii) Shall be construed to affect any other condition or requirement of any general, special or local law.