The state Senate passed the bill on a voice vote Tuesday. It cleared the Assembly last month and is now headed to Gov. Scott Walker.
The bipartisan bill would set the age requirement while also making it easier for people from out of state to officiate, removing a requirement that out-of-state officials must obtain a letter from the church before the wedding.
Opponents of the measure have raised concerns about the minimum age requirement, saying it could prevent young family members from officiating weddings in some cases.