Answer:
I am heavy forward but backward I am not. What am I?
I start new then become old. Start clean but be one dirty. I usually start big then become little.
I have wheels and flies yet I am not an aircraft.
There's a one-story house in which everything is green. Green walls green windows green doors. What color are the stairs?
A piece of paper that takes most people 3 or 4 years to get.
What did the piece of wood say when he saw the screwdriver and screws approaching?