52 U.S.C. § 30126
Prohibition of contributions by minors
An individual who is 17 years old or younger shall not make a contribution to a candidate or a contribution or donation to a committee of a political party.
( Pub. L. 92–225, title III, § 324 , as added Pub. L. 107–155, title III, § 318 , Mar. 27, 2002 , 116 Stat. 109 .)