I am getting married at 23 and am having a hard time deciding on my maid of honor. I would love for my younger sister to have this roll, but we are six years apart. At the time of the wedding she will only be 17. Are there any elements of the ceremony or reception in which she would need to be 18? Are there legal documents she would need to sign? I have no problem with having her delegate the bachelorette party to one of my older attendants, but before I ask her to be my maid of honor I want to make sure there is no rule that I don't know about. I would hate to retract my invitation. Help.