Section 31531 Of Article 3. Retirement Board From California Government Code >> Division 4. >> Title 3. >> Part 3. >> Chapter 3. >> Article 3.

. If it is impracticable for the board to determine from the records the length of service or the age of any member, or if the member refuses or fails to give the board a statement of his service or age, it may estimate his length of service or age for the purposes of this chapter.