Answer:
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
Both old people and owls are said to be possessing this trait
Half-way up the hill, I see you at last, lying beneath me with your sounds and sights. A city in the twilight, dim and vast, with smoking roofs, soft bells, and gleaming lights.
A skin have I, more eyes than one. I can be very nice when I am done.
I am so simple that I can only point. Yet I guide men all over the world.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.