For Chinese people, study abroad is an important matter. During the COVID-19 pandemic, many countries implemented travel regulation policies. Except for the early part of 2020, however, long term residents, including international students, were allowed to enter Japan. Despite the COVID pandemic, some of the degree program students entered Japan from abroad. In addition, as soon as the international travel regulations ended, a huge number of non-degree students including kenkyusei（ research students） and language program students rushed to Japan.

During the COVID time, international students could not enter Japan easily. Until March 2022, regulation and deregulation for degree course students often changed in Japan. Like tourists, furthermore, non-degree shorter student mobility opened later. For exchange, research, and other short course students, they needed to wait until October 2022 to come to Japan.

In the 2000s, English-Medium Instruction (EMI) in non-English countries developed worldwide. Japan is one of these countries and the number of English-based students who cannot utilize Japanese language increased. Some of the Japanese universities offer dormitories for international students, who can gradually get used to learning the Japanese way of life after they arrive in Japan. Some of the universities also offer cultural exchange programs for EMI students. However, due to the COVID-19, the situation has changed.

The purpose of this study was to compare demographic trends in the aging of the Japanese and Brazilian populations on the basis of health indicator data collected by the statistics bureaus of the Japanese and Brazilian governments. The demographic and health indicator data from surveys by the Statistics Bureaus of the Japanese and Brazilian governments and other sources were obtained from websites. The data showed that Japan has an aging population, that the number of elderly persons in Japan is increasing and that the Government of Japan has a plan to address future demands for health resources by this aging population, whereas Brazil has a rapidly population aging but no plan for its future health services. Brazil may need to increase the number of hospitals and hospital beds and develop a medical care plan for the elderly within its Unified Health System.

To minimize the impact of the COVID-19 pandemic, the Japanese government regulated the mobility of international visitors including students. Before March 2020, international students could enter Japan without restriction. During October and November 2020, a limited number of international students entered Japan with expensive air fares and a 14-day quarantine. However, except these months, many students, especially newly enrolled ones, could not enter Japan.

Due to the COVID-19, many countries including Japan have reinforced regulations at the borders. As many international students could not enter Japan due to the COVID-19 pandemic, some universities offered online education services as an alternate. On the other hand, since April 2020, many of international student livening in Japan have not been able to go back to their countries.