Answer:
Both old people and owls are said to be possessing this trait
What two things can always see what the other sees, but can never see each other?
I have many feathers to help me fly. I have a body and head, but I'm not alive. It is your strength which determines how far I go. You can hold me in your hand, but I'm never thrown.
It floats over the land, It cuts the tallest mountain, Its voice is like a fountain, Its body like a snake, Will flow into a lake.
What do people want the least on their hands?
I am owned by Old McDonald.