(a) Except for duty disability retirement, no member may retire before January 1, 2011.
(b) On or after the date a member attains early or normal retirement age, a member may retire and commence to receive retirement income payments on the first day of the calendar month following termination of employment and receipt of his or her written application for retirement in an amount as provided under this article: Provided, That retirement income payments under this plan are subject to the provisions of this article. Upon receipt of a request for estimation of benefits, the board shall promptly provide the member with an explanation of his or her optional forms of retirement benefits and the estimated gross monthly annuity. Upon receipt of properly executed retirement application forms from the member, the board shall process member's request for and commence payments as soon as administratively feasible.