Answer:
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
What two keys cannot open any door?
I wiggle and cannot see; sometimes underground and sometimes on a tree. I really don't want to be on a hook and I become a person when combined with “book”.
I go up and never come down no matter how hard you wish. As I get higher, more wrinkles crawl on to the face. What am I?
It's in your hand though you can not feel it. Only you and time can reveal it.
A little house full of meat, no door to go in and eat.