5 C.F.R. § 831.113
Payments to children
For purposes of section 8345(e) of title 5, United States Code, persons who have attained age 18 are considered adults regardless of the age of majority in the jurisdiction in which they reside.
For purposes of section 8345(e) of title 5, United States Code, persons who have attained age 18 are considered adults regardless of the age of majority in the jurisdiction in which they reside.