Answer:
I am a type of cheese made backwards
Never ahead, ever behind, yet flying swiftly past; for a child, I last forever; for an adult, I'm gone too fast. What am I?
I run up and down the stairs without moving
I am expelled from you orally with a sound
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around. What am I?
I have feet on my head