20 C.F.R. § 229.52 Age reduction when a reduced age O/M is effective before DIB O/M.
Title 20 - Employees' Benefits
If an employee received a reduced age O/M before the effective date of a DIB O/M, the PIA amount for the DIB O/M is reduced as if the employee had attained retirement age on the effective date of the DIB O/M.
Title 20: Employees' Benefits
PART 229—SOCIAL SECURITY OVERALL MINIMUM GUARANTEE
Subpart F—Computation of the Overall Minimum Rate
§ 229.52 Age reduction when a reduced age O/M is effective before DIB O/M.