You know as much as you can when you don't know enough The hard
part is growing old without growing up  from XV – Zombieland
Rule 32 Lyrics on Rap Genius   The first line basically goes
with the old saying “ignorance is bliss.” It’s a lot easier to
enjoy the little things when you don’t know that the world is
ending.  The second half XV is referring to how to keep a hold
of childhood things while still having responsibilities. No one
wants to be too mature.  To help improve the meaning of these
lyrics, visit "Zombieland Rule 32" by XV Lyrics and leave a
comment on the lyrics box