ZiG is the youngest currency in the world .
Below are 9 of the oldest currencies in the world in descending order

Macanese Pataca- 1894- Macau
Japanese Yen- 1871- Japan
Dominican Peso- 1844- Dominican Republic
Falkland Islands Pound -1833- Falklands
Haitian gourde- 1813-

So a National Anthem , National Flag, National Currency are treated as sovereign heritage and cannot be changed willy nilly , you can change design on currency to reflect what a Nation is celebrating or commemorating but the name remains the same , Zimbabwean Dollar anchored by