[vladms]

Considering the differences in living prices in major capitals and other cities, I would claim you can do that (career break/retire early) even today in multiple countries in Europe.

But that would mostly mean changing places. If you go and work 10-15 years in an expensive/high pay city, you could retire in a less expensive city.

On the other hand if you expect that everything will be as when you were working (place, expenses, etc.), I am not sure it is the case even in the US for early retirements ...