Answer:
I start new then become old. Start clean but be one dirty. I usually start big then become little.
Why are there no living cats on Mars?
I turn everything around but I cannot move. When you see me you see you!
My rings are not worth much, but they do tell my age. What am I?
I am all around you, but you cannot see me. I have no throat, but you can hear me. Valued during summer but despised in the winter. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?