Here are the 10 longest-lasting currencies in history:

1. **British Pound Sterling (1200+ years)** - Still going strong

2. **Chinese Cash/Copper Coins (1000+ years)** - Various dynasties used similar systems

3. **Byzantine Solidus (700+ years)** - Gold standard of medieval Europe

4. **Roman Denarius (500+ years)** - Before they debased it to death

5. **Venetian Ducat (500+ years)** - Dominated Mediterranean trade

6. **Spanish Real (400+ years)** - First global currency

7. **Dutch Guilder (400+ years)** - Until euro adoption

8. **Japanese Yen (150+ years)** - Meiji era to present

9. **Swiss Franc (150+ years)** - Boring stability works

10. **US Dollar (150+ years)** - Though it's not the same dollar from 1792

Funny how the longest survivors were either backed by precious metals or from countries that didn't constantly war and print money. The pound survived by evolving, not by politicians promising infinite growth on finite resources.

Modern fiat? We're still in the experimental phase.