20 C.F.R. § 416.803
Generally, the highest probative value will be accorded to a public record of birth or a religious record of birth or baptism established or recorded before age 5. Where such record is not available, and other documents are submitted as evidence of age, in determining their probative value, consideration will be given to when such other documents were established or recorded, and the circumstances attending their establishment or recordation. Among the documents which may be submitted for such purpose are: school record, census record, Bible or other family record, church record of baptism or confirmation in youth or early adult life, insurance policy, marriage record, employment record, labor union record, fraternal organization record, military record, voting record, vaccination record, delayed birth certificate, birth certificate of child of applicant, physician's or midwife's record of birth, immigration record, naturalization record, or passport.
20 C.F.R. §416.803