(a)(1) Each member who retires or who has been retired under the retirement system before attaining full retirement age under the Social Security Act, as amended from time to time, shall receive additional temporary monthly retirement income payable until such member reaches full retirement age under said Social Security Act or, if earlier, the date on which such member would be eligible for a Social Security disability insurance benefit. (2) The amount of such temporary income shall be determined by the Retirement Commission so that the total retirement income payable to the member during the temporary period shall equal that payable under the provisions of the retirement system in effect immediately before February 21, 1958, modified to the extent that the three highest-paid years rather than the five highest-paid years shall be used in determining the retirement income.

(b) If the Retirement Commission finds, for a member who became a state employee on or before February 21, 1958, that the total of his monthly retirement income and the Social Security benefit he is entitled to receive resulting from state service at retirement is less than the retirement salary he would have received under the provisions of the retirement system in effect immediately before February 21, 1958, modified to the extent that the three highest-paid years rather than the five highest-paid years shall be used in determining the retirement income, then the Retirement Commission shall increase his monthly retirement income accordingly during the period when such lower total applies.

(c) Except as provided in § 5-163a, a member whose state service is terminated because of economy, lack of work, abolition of his position or lack of reappointment to a position in the unclassified service, or who, being an Army or Air National Guard technician in the Military Department, is dismissed by reason of separation from the National Guard because of age, after he has completed twenty-five years of state service but before he has reached his fifty-fifth birthday, shall be entitled to a retirement income. The amount of each monthly payment shall be determined from subsection (c) of § 5-162, if the member elects the first day of the month on or after such birthday as his retirement date; and shall be the actuarial equivalent of such amount, as determined by the Retirement Commission, if the member elects the first day of the month on or after his termination date as his retirement date.