Jacek Podsiadlo (for many critics a typically 'Polish New York School' poet), is a 'new generation' poet but he uses the some poetic strategies like old poets before him but with new ' language effects' etc.
Rozewicz was born before WW II. He is a Polish classic poet, but different. He is not the same as the Polish 'monumental poets' (Milosz-Herbert).
Swietlicki is a Polish Beat poet
I think this is not a question young-old, not a generation confrontation, but something else.
Public language versus private language.
Nation versus the individual etc.