The observation came from an analysis of 66,000 business leaders in LinkedIn China's proprietary member database, covering 350 major corporations across 18 industries.
The number of people aged 60 or above reached 241 million in China by the end of 2017, accounting for 17.3 percent of the total population.
The office stressed that Chinese people will not be intimidated by any external pressure or coercion and that any plot to mess up Hong Kong is doomed to fail.
The notification came after media reports said that Lufax, the internet financial arm of Ping An, is expected to list as soon as March and its online medical platform PA Good Doctor may follow subsequently.
The number of registered privately offered funds rose by 1.92 percent month on month to 94,739 by the end of last month.
The notice said schools could adjust their schooling arrangements or stop classes according to the changes in weather.
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The observatory advised said workers exposed to high temperatures should take protective measures.
The next three to five years are a key period for China. The country should speed up reform of State-owned enterprise systems, reform of science and technology innovation systems and the cultivation of domestic markets, he added.
The office is obligated to analyze and appraise national security situation in the HKSAR, and provide comments and suggestions for major strategies and policies in this regard.
The number of US buyers also declined by 4.07 percent to 10,739, mainly due to uncertainties brought by the trade conflict between China and the US, Xu said.