CA Bus & Prof Code Section 18702

(a)

No person under 18 years of age shall participate as a contestant in any professional contest or match or exhibition.

(b)

Any person, irrespective of age, may participate as a contestant in an amateur contest, match, or exhibition with the approval of the commission subject to Section 18642.

(c)

Consistent with Section 18640, the commission shall have jurisdiction over all forms and combinations of forms of full contact martial arts contests involving participants 18 years of age or younger.