that's an arbitrary number. The EU was officially created in 1993. So a better question would be, can we find a 23 year period before the EU where none of the founder members were at war with each other? Yeah you can. About 3 of them.
The EU traces its origins from the European Coal and Steel Community (ECSC) and the European Economic Community (EEC), formed by the Inner Six countries in 1951 and 1958 [..] The Maastricht Treaty established the European Union under its current name in 1993
If your position is that every major treaty establishes a new Union, then the EU is less than 10 years old (Treaty of Lisbon, 2009). Otherwise, the EU originated in 1951.
