Looking at adjectives like "alt", "jung", "lang", "kurz" and their respective comparative degree "älter", etc. I get the impression that their sense is inversed.
Like in "älteres Auto"/older car, the car is not as old as the "altes Auto"/old car. Or the "längerer Weg"/longer route is actually shorter than "langer Weg".
Why is this and when is this used? Is this a stylistic device like an oxymoron ("Alter Knabe"/old boy)?