Section 14-15-104 - Requisites of a valid civil union(1) To establish a civil union in Colorado, the two parties to the civil union shall satisfy all of the following criteria: (a) Both parties are adults, regardless of the gender of either party;(b) Neither party is a party to another civil union;(c) Neither party is married to another person.Added by 2013 Ch. 49,§ 1, eff. 5/1/2013.L. 2013: Entire article added, (SB 13-011), ch. 49, p. 148, § 1, effective May 1.