Answer:
It's been around for millions of years, but is never more than a month old. What is it?
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
I am mother and father, but never birth or nurse. I'm rarely still, but I never wander.
You can spin, wheel and twist. But this thing can turn without moving.
Long and slinky like a trout, never sings till it's guts come out.
You use it between your head and your toes, the more it works the thinner it grows.