The application shall be made while the member is in service, within four months after his or her discontinuance of service, within four months after the expiration of any period during which a presumption is extended beyond his or her discontinuance of service, or while, from the date of discontinuance of service to the time of the application, he or she is continuously physically or mentally incapacitated to perform his or her duties.
Ca. Gov. Code § 31722