Answer:
I have green hair a round red head and a long thin white beard.
I am always around you but often forgotten. I am pure and clean most time but occasionally rotten.
I am lighter than air, but a hundred people cannot lift me. Careful, I am fragile. What am I?
I grow up while growing down
The shorter I am the bigger I am.
No matter how little or how much you use me, you change me every month.
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic