20 C.F.R. § 404.641

A request to withdraw an application may be cancelled and the application reinstated if—

(a) A written request for cancellation is filed at a place described in § 404.614 by the claimant or someone who may sign an application for the claimant under § 404.612;

(b) The claimant is alive at the time the request for cancellation is filed; and

(c) For a cancellation request received after we have approved the withdrawal, the request is filed no later than 60 days after the date of the notice of approval.