Answer:
Travel a mile and I will change, travel a million and I will end as I started. What am I?
What has roots that nobody sees and is taller than trees. Up up up it goes and yet never grows?
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?
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
No matter how little or how much you use me, you change me every month.