20 C.F.R. § 216.52 Who is eligible for an annuity as a divorced spouse.
Title 20 - Employees' Benefits
To be eligible for a divorced spouse annuity, the employee annuitant must be at least age 62 and the divorced spouse (see §222.22 of this chapter) must: (a) Be the divorced wife or husband of an employee; (b) Stop work for a railroad employer; (c) Not be entitled to an old-age or disability benefit under the Social Security Act based on a primary insurance amount that is equal to or greater than one-half of the employee's tier I primary insurance amount; and either (d) Have attained retirement age; or (e) Have attained age 62 but be under retirement age. The annuity is reduced for each month the spouse is under retirement age at the time the annuity begins.
Title 20: Employees' Benefits
PART 216—ELIGIBILITY FOR AN ANNUITY
Subpart F—Spouse and Divorced Spouse Annuities
§ 216.52 Who is eligible for an annuity as a divorced spouse.

