Polygamy accidentally created sister missionaries and lowered the missionary age for everyone. The Church of Jesus Christ of Latter-day Saints (LDS Church, Mormon Church) just announced that women can serve full-time proselyting missions as young as 18 years old. This means that both men and women will be serving lds missions at the same age, forever altering the gender dynamics of Mormon missions around the Church. This decision represents the culmination of over 150 years of evolution of what it means to be an LDS missionary and how that fits into our model of priesthood.