In The Church of Jesus Christ of Latter-day Saints (commonly called the Mormon Church), girls from 12 to 18 are in the Young Women Program. This program is split into three groups of three different age levels so girls can develop skills appropriate to their age. Beehives are ages 12 to 13, Mia Maids are ages 14 to 15, and Laurels are 16 to 17. Upon her eighteenth birthday, a young woman may choose to attend Relief Society with the older women of her ward (congregation) or to continue in Young Women until she graduates from high school.
Source: Mormon Youth Beliefs