20 C.F.R. § 404.745 Evidence of school attendance for child age 18 or older.
Title 20 - Employees' Benefits
If you apply for child's benefits as a student age 18 or over, we may ask for evidence you are attending school. We may also ask for evidence from the school you attend showing your status at the school. We will ask for the following evidence: (a) Your signed statement that you are attending school full-time and are not being paid by an employer to attend school. (b) If you apply before the school year has started and the school is not a high school, a letter of acceptance from the school, receipted bill, or other evidence showing you have enrolled or been accepted at that school.
Title 20: Employees' Benefits
PART 404—FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950– )
Subpart H—Evidence
Evidence for Child's and Parent's Benefits
§ 404.745 Evidence of school attendance for child age 18 or older.