Girl's Life: Shijir-Erdene, 15, Ulaanbaatar
Shijir-Erdene, 15, lives in the Ger district in Ulaanbaatar. "Mongolians have a saying: You have a girl, you're happy. You have a boy: you're lucky." Part of a WSJ special project, 2050: Demographic Destiny. Photo: Jacob Russell/Cyrus Moussavi for The Wall Street Journal