Why does Langsha Co., Ltd. rise? Many large hospitals in Hong Kong cooperate... Phoenix.com nbsp; 9 hours ago. The background of Shanghai's encouragement of having a second child is: In the city's population with registered residence, the population of elderly people aged 60 and above was 3.0057 million last year, accounting for 21.61% of the population with registered residence. The degree of aging has approached that of Japan.