"Age": Age at the latest birthday. In the computation of any retirement annuity, the actuarial factor shall be prorated for the number of days between the employee's last birthday and his age on the effective date of the annuity.
40 ILCS 5/12-123
Age
P.A. 86-272.
Official source: Illinois General Assembly. Reproduced from public-domain Illinois statutes; confirm against the official source for the current text. Not legal advice.