(1) A member who is 60 years of age or older and has 10 or more years of credited service or a member who is 60 years of age or older and has 5 or more years of credited service as provided in section 20(4) or (5) may retire upon written application to the retirement board, stating a date on which he or she desires to retire. Beginning on the retirement allowance effective date, he or she shall receive a retirement allowance computed according to section 20(1).

    (2) A member who is 55 years of age or older, but less than 60 years of age, and has 15 or more years of credited service, may retire upon written application to the retirement board stating a date on which he or she desires to retire. Upon retirement he or she shall receive a retirement allowance computed according to section 20(1). Except as otherwise provided in this act, the retirement allowance of a member who has less than 30 years of credited service shall be reduced by an amount that is 0.5% of the retirement allowance multiplied by the number of months the person's age at retirement is under 60 years. The reduction of 1/2 of 1% for each month and fraction of a month from the member's retirement allowance effective date to the date of the member's sixtieth birthday provided for in this subsection does not apply to a member who retired before July 1, 1974 and before attainment of age 60, with 30 or more years of credited service. The retirement allowance of a retirant or beneficiary of a retirant who retired before that date shall be recalculated disregarding the reduction, and the person receiving the retirement allowance is eligible to receive an adjusted retirement allowance based on the recalculation beginning October 1, 1987, but is not eligible to receive the adjusted amount attributable to any month beginning before October 1, 1987. The recalculated retirement allowance provided by this subsection shall be paid by January 1, 1988. The retirement allowance of a retirant who dies before January 1, 1988, and who has not nominated a retirement allowance beneficiary pursuant to section 31, shall not be recalculated pursuant to this subsection.

    (3) Notwithstanding any other provision of this section, effective April 1, 1988, a member may retire with a retirement allowance computed according to section 20(1), without regard to the reduction in subsection (2), if all of the following apply:

    (a) The member files a written application with the retirement board stating a date, not less than 30 or more than 90 days after the execution and filing of the application, on which the member desires to retire, and which is within the early retirement effective period.

    (b) The member was employed by the state for the 6-month period immediately preceding the member's retirement allowance effective date. This subdivision does not apply to a member who had been restored to active service during that 6-month period pursuant to section 33.

    (c) On the last day of the month immediately preceding the retirement allowance effective date stated in the application, the member's combined age and length of credited service is equal to or greater than 80 years and the member is 50 years of age or older.

    (d) For purposes of this subsection, "early retirement effective period" means 1 of the following:

    (i) Except as provided in subparagraph (ii), the period beginning on April 1, 1988 and ending on April 1, 1989.

    (ii) For a member employed by a hospital or facility owned or operated by the department formerly known as the department of mental health that is in the process of being closed by the department formerly known as the department of mental health, the period beginning on April 1, 1988 and ending on October 1, 1989.

    (4) As used in subsections (5) to (9):

    (a) "Agency of the department" means 1 of the following:

    (i) Southwest Michigan community living services.

    (ii) Wayne community living services.

    (b) "Department inpatient facility" means 1 of the following:

    (i) A developmental disability center that is directly operated by the department formerly known as the department of mental health for purposes of providing inpatient care and treatment services to persons with developmental disabilities.

    (ii) A psychiatric hospital that is directly operated by the department formerly known as the department of mental health for purposes of providing inpatient diagnostic and therapeutic services to persons who are mentally ill.

    (5) Notwithstanding any other provision of this section, a member who is an employee of an agency of the department or a department inpatient facility and is on layoff status because the agency or inpatient facility has been designated by the state officer formerly known as the director of mental health for closure on or after October 1, 1989, may retire as provided in subsection (7) or (8), as applicable, with a retirement allowance computed according to section 20(1), without regard to the reduction in subsection (2), upon satisfaction of any 1 of the following conditions:

    (a) The member is 51 years of age or older and has 25 or more years of credited service, the last 5 of which are as an employee of an agency of the department designated for closure or a department inpatient facility designated for closure.

    (b) The member is at least 56 years of age and has 10 or more years of credited service, the last 5 of which are as an employee of an agency of the department designated for closure or a department inpatient facility designated for closure.

    (c) The member has 25 or more years of credited service, regardless of age, as an employee of an agency of the department designated for closure or a department inpatient facility designated for closure.

    (6) When a department inpatient facility or agency is designated for closure on or after October 1, 1989, the state officer formerly known as the director of mental health shall certify in writing to the state legislature and the retirement board, not less than 240 days before the designated official date of closure, which facility or agency is to be closed and the designated official date of closure.

    (7) Except as provided in subsection (8), a member who is eligible to receive a retirement allowance under subsection (5) may retire effective on the date that an agency of the department or a department inpatient facility designated for closure as provided in subsection (5) actually closes, upon written application to the retirement board not less than 30 or more than 180 days before the designated official date of closure. Beginning on the retirement allowance effective date, he or she shall receive a retirement allowance computed according to section 20(1).

    (8) A member who is on layoff status, is not working for the state, and becomes eligible to receive a retirement allowance under subsection (5) and who was an employee of an agency of the department or a department inpatient facility that has been designated for closure as provided in subsection (5) and that actually closes on or after October 1, 1989, may retire upon written application to the retirement board, stating a date upon which he or she wishes to retire. Beginning on the retirement allowance effective date, he or she shall receive a retirement allowance computed according to section 20(1).

    (9) Any additional accrued actuarial cost and costs for health insurance resulting from the implementation of subsection (5) shall be funded from appropriations to the department formerly known as the department of mental health for this purpose.

    (10) A member who is an employee of the state accident fund on the date of transfer to a permitted transferee as that term is defined by section 701a of the worker's disability compensation act of 1969, 1969 PA 317, MCL 418.701a, may retire if the member's age and his or her length of service is equal to or greater than 70 years on the date of transfer. The member may retire upon written application to the retirement board, stating a date, not less than 30 or more than 90 days after the execution and filing of the application, on which he or she desires to retire. Beginning on the retirement allowance effective date, he or she shall receive a retirement allowance computed according to section 20(1) without regard to the reduction required by subsection (2).

    (11) A member who is an employee of the Michigan biologic products institute on the date the institute is conveyed pursuant to the Michigan biologic products institute transfer act, 1996 PA 522, MCL 333.26331 to 333.26340, may retire if the member's age and his or her length of service is equal to or greater than 70 years on the date of the conveyance. The member may retire upon written application to the retirement board, stating a date, not less than 30 or more than 90 days after the execution and filing of the application, on which he or she desires to retire. Beginning on the retirement allowance effective date, he or she shall receive a retirement allowance computed according to section 20(1) without regard to the reduction required by subsection (2).

    (12) A member who is an employee of the liquor control commission created by section 209 of the Michigan liquor control code of 1998, 1998 PA 5, MCL 436.1209, whose employment is terminated due to the privatization of the distribution of spirits within this state is effectuated pursuant to the resolution and order adopted by the liquor control commission on February 7, 1996, a plan adopted pursuant to statute or court order, or a plan adopted pursuant to both statute and order of the liquor control commission may retire if the member's age and his or her length of service is equal to or greater than 70 years on the date the privatization is effectuated. The member may retire under this subsection upon written application to the retirement board, stating a date, not less than 30 or more than 90 days after the execution and filing of the application, on which he or she desires to retire. Beginning on the retirement allowance effective date, he or she shall receive a retirement allowance computed according to section 20(1), without regard to the reduction required by subsection (2). The cost of benefits paid under this section shall be paid out of the revolving fund created under section 221 of the Michigan liquor control code of 1998, 1998 PA 58, MCL 436.1221.