China's urban pet population is projected to nearly double the number of children under age four by 2030. Young Chinese adults aged 23-33 make up almost half of pet owners in China and are less inclined to have children. China's declining birth rate is expected to fall due to fewer women aged 20-35. Cat ownership is forecasted to surpass dogs in China as cats require less living space. Globally, falling birth rates mean the world's population will peak this century as countries like China face population declines.