The number of registered residents who are aged 60 or above in Beijing is expected to reach 3.8 million by 2020, according to the office.
The newspaper, citing "people familiar with the matter", did not say how many people would return by the Sept 21 deadline.
The oldest pieces in the museum are Swiss machine tools for making watches dating to the 1830s.
The number of new jobs was 160,000 higher than that in the same period last year, and the unemployment rate was down 0.07 percentage points from a year earlier and 0.05 percentage points lower compared with the previous quarter, official data showed.
The number of cases in the US is extremely small, but infections could increase rapidly and mirror the outbreaks in Italy or South Korea, a researcher warned.
The official manufacturing PMI rose to 51.7 in June, accelerating from 51.2 in May, marking a three-month high. June's official non-manufacturing PMI also improved for the second month in a row to 54.9, from 54.5 in May, providing evidence of a better economic structure.
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The official would not speculate on where the summit would be held, but one logical option could be the UN General Assembly, where world leaders gather annually in September, Reuters said.
The number of short-video users hit 818 million in June, with an average time of 110 minutes spent on short-video apps per person each day, surpassing that of instant messaging services, the report said.
The number of automated ports is expected to reach 100 by 2020, according to Kalmar, a Finland-headquartered cargo handling solutions and services provider.
The ongoing 37th ASEAN Summit and related summits take place from Thursday to Sunday via video conferences.