| Country | Aging society → Aged society | Aged society → Post-aged society |
| France | 115 years | 45 years |
| UK | 47 years | 37 years |
| Germany | 40 years | 37 years |
| US | 73 years | 21 years |
| Japan | 24 years | 12 years |
| South Korea | 18 years | 8 years |