Answer:
I am wood that is neither hard straight or crooked
What goes up and down stairs without moving?
I get thrown in the air and will fall down. I get thrown down and I will rise in the air. What am I?
I go up and never come down no matter how hard you wish. As I get higher more wrinkles crawl onto your face.
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
What never gets any wetter no matter how hard it rains?