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.