Answer:
Both old people and owls are said to be possessing this trait
Sometimes black, sometimes white, I have veins but no blood
I follow the orders of only two. I respect the work of only two. I am in constant battles with many, Though one surpassed them all. With forces joined, We created hell, Until our mutual enemy fell. Who am I?
I never was, am always to be. No one ever saw me, nor ever will. And yet I am the confidence of all, To live and breath on this terrestrial ball.
It is a path of cow juice spread across the sky but cannot be seen by the naked eye
It is something you make after you've weighed your options.