Kids Riddles

Question: For now I must stay under the man who made me,
but when he dies I'll be as powerful as he.
They will watch and listen to what I say,
then some of their money to me they'll pay.

Who am I?

Question: You are in a car with some helium balloons and hit the gas. While you accelerate, which way does the balloon move?

Question: I give advice to others,
yet I know nothing myself.
I am a hitchhiker destined to stay still.

Question: Filled with garb,
the price is free.
Just return what you don't need.

What am I?

Question: Paul is 20 years old in 1980, but only 15 years old in 1985.How is this possible?