Answer:
I am an odd number. Take away a letter and I become even. What number am I?
So simple, that I can only point. Yet I guide men all over the world.
I am always in front of you, but yet I am never here. What am I?
Find me on body builders or in the drink aisle. What am I?
What has a neck but no head?
No matter how little or how much you use me, you change me every month.