Guo Min, 60, walks past a young mom and son with her twins. Despite financial difficulties, Guo is happily living with her pair of 4-year-old twins. Four years ago, she gave birth to a son and daughter at 56. They were conceived through in vitro fertilization. She became the oldest new mom in Beijing, after her only daughter died in 2005 from a car accident. [Photo/qq.com]