Answer:
What is the freedom of birds and the pen of old men?
Tall in the morning, short at noon, gone at night. But I'll be back soon.
Up on high I wave away but not a word can I say.
I cannot be other than what I am, until the man who made me dies. Power and glory will fall to me finally. Only when he last closes his eyes.
No matter how little or how much you use me, you change me every month.
It is the transportation of choice for princesses to attend balls.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?