Answer:
Old people and owls are said to be this.
Touch this and you'll regret it. But if it's cold, you won't forget it. What is it?
Power enough to smash ships and crush roofs. Yet it still must fear the sun.
Even if you throw it away, it still comes back.
What goes up and down without moving?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.