20 C.F.R. § 416.806
Where documentary evidence of age recorded at least 3 years before the application is filed, which reasonably supports an aged applicant's allegation as to his age, is submitted, payment of benefits may be initiated even though additional evidence of age may be required by §§ 416.801 through 416.805 . The applicant will be advised that additional evidence is required and that, if it is subsequently established that the prior finding of age is incorrect, the applicant will be liable for refund of any overpayment he has received. If any of the evidence initially submitted tends to show that the age of the applicant or such other person does not correspond with the alleged age, no benefits will be paid until the evidence required by §§ 416.801 through 416.805 is submitted.
20 C.F.R. §416.806