From the table above shows how the populations aged 65 and over in three countries which are Australia, Belgium, and Costa Rica since 1900-2000. The table shows the populations aged 65 decline from 1950 to 1990, but there is exponential grow from 1990-2000. In 1950, there were more people living in Belgium than Australia and Costa Rica. The number of Belgium percentage populations was 10%, while Australia and Costa Rica was 7% and 4%. Between 1950 and 1990, all countries had been declined 2% for Belgium and Australia, but Costa Rica declined just 1%. Then, between 1900 and 2000, all countries had been growth over 10% percentage population. The highest percentage of population is Belgium with 18% followed by Australia 15% and Costa Rica 12%. According to the table, the growth population aged 65 in Belgium and Australia was same over the same period in between 1950 - 2000. Some reason probably that the country have already address issues such as healthcare provision, pension systems,...