Remove grammatical mistakes: At the beginning of 21st century, we have to deal with a series of global issues, among them the aging population should be considered as a black spot.
The number of people aged 65 and older is expected to reach 2020, and the number of people aged 65 and above is expected to increase by 2030.
The number of people aged 65 and above is expected to increase by 2030, and the number of people aged 65 and above is expected to increase by 2050.
The number of people aged 65 and above is expected to
The 2019 census has been postponed for 2020.
The 2019 census is the most important event in the history of the country. It is the first time that the population of the country has been counted.
The 2019 census is the most important event in the history of the country.
The 2019 census is the most important event in the history of the country.
The 2019 census