California Code, Family Code - FAM § 7580

(a) Notwithstanding subdivision (c) of Section 7573, a voluntary declaration of parentage that is signed by a minor parent does not establish parentage until 60 days after both signatories have reached 18 years of age or are emancipated, whichever first occurs.

(b) A person who signs a voluntary declaration of parentage as a minor may rescind the voluntary declaration of parentage at any time up to 60 days after the signatory reaches 18 years of age or becomes emancipated, whichever first occurs.

(c) A voluntary declaration of parentage signed by a minor creates a rebuttable presumption for or against parentage until the date that it establishes parentage as specified in subdivision (a).

(d) A voluntary declaration of parentage signed by a minor shall be admissible as evidence in a civil action to establish parentage of the minor named in the voluntary declaration.

(e) A voluntary declaration of parentage that is signed by a minor shall not be admissible as evidence in a criminal prosecution for violation of Section 261.5 of the Penal Code.