'Catch 22' had quite an effect on me when I read it as young man. I'm not sure whether I will read it again, I'm worried it might dissapoint some 40 years later.
I went back and read it after reading it as a teenager fairly recently.
It still worked for me. It didn't quite have the same impact and the it sags a bit in the middle but it's still a great book that well, shaped the way I see the world.
The complexity of the structure, the humor, and the painful exhibition of human stupidity makes it a book for the ages.