Answer:
Never ahead, ever behind, yet flying swiftly past, for a child, I last forever, for adults, I'm gone too fast.
What can fill a room but takes up no space?
I love to twist and dance. Though wingless, I fly high up into the sky. What am I?
What can travel around the world while staying in a corner?
My keepers feed me colored balls. With sticks they store on my den walls. Sometimes I store them in my pouch. Sometimes deep in my belly; ouch!
What never gets any wetter no matter how hard it rains?