Normally, preferred evidence of age (see GN 00302.052) is conclusive proof of a claimant's DB, regardless of whether other documents are
presented showing a different DB. Studies have shown preferred evidence to have an
accuracy rate of about 99.5 percent.
However, there are extremely rare situations where the claimant alleges a different
DB than that shown on preferred evidence and presents a significant amount of evidence
with high probative value supporting the alleged DB. In such a situation, a preferred
evidence document can be overturned (i.e., the DB shown on the preferred evidence
would not be used by SSA).