An application for any monthly benefits under this section filed before the first month in which the applicant satisfies the requirements for such benefits shall be deemed a valid application (and shall be deemed to have been filed in such first month) only if the applicant satisfies the requirements for such benefits before the Commissioner of Social Security makes a final decision on the application and no request under section 405(b) of this title for notice and opportunity for a hearing thereon is made or, if such a request is made, before a decision based upon the evidence adduced at the hearing is made (regardless of whether such decision becomes the final decision of the Commissioner of Social Security).