The UN has determined that child marriage is a violation of human rights--and by child they mean anyone under 18. This is why. Teenagers are still children. Marrying older men makes teen women susceptible to manipulation and abuse, and is part of what fuels the gender stereotype of women being inferior. Having children at that age limits their education, career, and life choices, plus experiencing pregnancy too early can harm girls physically too. Currently 1 in 5 girls worldwide is married off as a child. :(