Answer:
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
The older they are the less wrinkles they have.
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
What has wings, but can not fly. Is enclosed, but can outside also lie. Can open itself up, or close itself away. Is the place of kings and queens and doggerel of every means. What is it upon which I stand? Which can lead us to different lands.
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.