Gov. Code, § 21381

(a) The retirement allowance referred to in this section excludes that portion of a member’s service retirement annuity that was purchased by his or her accumulated additional contributions.

(b) If a member entitled to credit for prior service retires after attaining the compulsory age for service retirement applicable to him or her, or if there is no compulsory age for service retirement applicable to the member and the member attains age 70, or if a member is entitled to be credited with 20 years of continuous state service and retires after attaining age 60, and his or her retirement allowance is less than one thousand two hundred dollars ($1,200) per year and less than his or her final compensation, his or her prior or current service pension, as the case may be, shall be increased so as to cause his or her total retirement allowance from this system, and from the retiring annuities system of the university, if any, to amount to one thousand two hundred dollars ($1,200) per year, or his or her final compensation, whichever is less.

If a member to whom this section applies is employed by more than one employer, his or her aggregate retirement allowances shall be taken into account irrespective of the employer.