Answer:
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.
What flies without wings? What passes all things? What mends all sorrow? What brings the morrow?
Long and slinky like a trout, never sings till it's guts come out.
Some try to hide, some try to cheat. But time will show, we always will meet. Try as you might, to guess my name. I promise you'll know, when you I do claim.
Both old people and owls are said to be possessing this trait
I stay where I am when I go off. What am I?