Answer:
My life can be measured in hours. I serve by being devoured. Thin, I am quick. Fat, I am slow. Wind is my foe.
What flies forever, Rests never?
I am a good state, there can be no doubt of itΝΎ But those who are in, entirely are out of it.
Dies half its life. Lives the rest. Dances without music. Breathes without breath.
Runs smoother than any rhyme, loves to fall but cannot climb!
I am owned by Old McDonald.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?