A present employee who (1) attains age 50 or more but less than 57 while in service, having 10 or more years of service at the date of withdrawal or (2) withdraws with 10 or more years of service before age 50 and thereafter attains age 50 while out of service, is entitled to an age and service annuity and prior service annuity from the date of withdrawal or after attainment of age 50, respectively, in such amount as can be provided from the total of the following:
The annuity provided in this section for an employee who attains age 50 out of service shall be computed as though the employee were exactly age 50 at the time the annuity is granted, regardless of his actual age when application for annuity is made, and no such employee has any right to any annuity on account of any time between the date he attains age 50 and the date of application for annuity, nor shall any annuity be payable if the employee has received a refund of contributions.
Annuity in excess of that fixed by this section shall not be granted unless the employee re-enters the service before age 57. If such re-entry occurs, his annuity shall be provided in accordance with this section or section 5-125, whichever is applicable.
40 ILCS 5/5-126