Answer:
Both old people and owls are said to be possessing this trait
Although my cow is dead, I still beat herΒ What a racket she makes.
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
In your fire you hear me scream, creaking and whining, yet I am dead before you lay me in your hearth.
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty.
You use it between your head and your toes, the more it works the thinner it grows.