Annuity in excess of that fixed in Sections 8--131, 8--132 or 8--133 shall not be granted to any employee described therein, unless he reentered service before age 65. If such reentry occurs, his annuity shall be provided in accordance with Sections 8--130 to 8--133, inclusive, whichever are applicable.
40 ILCS 5/8-134