Answer:
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
When I get closer my tail grows longer, but when I go away my tail leads the way.
What begins and has no end? What is the ending of all that begins?
He has married many women, but has never been married. Who is he?
Take off my skin, I won't cry, but you will.
What did the piece of wood say when he saw the screwdriver and screws approaching?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?