The aging society

1. The changing population pyramid.
   1. Fewer children.
   2. Fewer working-age adults.
   3. More retirees.
   4. Rising old-age dependency ratios.
2. Longevity and fertility.
   1. Longer lives.
   2. Healthy life expectancy.
   3. Compression or expansion of morbidity.
   4. The interaction between longevity and low fertility.