Answer:
I grow up while growing down
I cannot be bought, cannot be sold, even if I'm sometimes made of gold. What am I?
The more of me you take, the more I appear behind you. What am I?
What is easy to spot but hard to find?
People need me yet they give me away every day.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic