California Code, Education Code - EDC § 24346

(a) A member who has a preretirement election of an option in effect on December 31, 2006, pursuant to paragraphs (1) to (6), inclusive, of subdivision (a) of Section 24300 may change his or her preretirement election to an option described in paragraph (1), (2), or (3) of subdivision (a) of Section 24300.1 without the allowance reduction described in Sections 24309 and 24310, provided the change is made on or after January 1, 2007, and prior to July 1, 2007.

(b) A member who has a preretirement election of Option 8 as described in Section 24300 in effect on December 31, 2006, and in that Option 8 election has an option pursuant to paragraphs (1) to (6), inclusive, of subdivision (a) of Section 24300, may change any of the options under paragraphs (1) to (6), inclusive, of subdivision (a) of Section 24300 to an option described in paragraph (1), (2), or (3) of subdivision (a) of Section 24300.1 without the allowance reduction described in Sections 24309 and 24310, if change is made on or after January 1, 2007, and prior to July 1, 2007.  A member may not change the portion of the unmodified benefit that would be modified pursuant to that prior option.

(c) The election to change the option by a member as described in this section shall be subject to all of the following:

(d) If the member elects to change options as described in this section, the age of the member and the option beneficiary on the effective date of the prior preretirement option election shall be the age used to calculate the member's benefit at the time of retirement.