Fun Riddles

Question: A thousand wheels, but move I do not.
Call me what I am, call me a lot.

What am I?

Question: Why can't Kevin, who is now living in Canada, not be buried in the USA?

Question: The more of me you have, the longer your life.
The more of me you have, the less you have left.

What am I?

Question: A man finds a small iron coin dated 154 B.C., what's it worth?

Question: I'm number three.
But I'm not a number.
I'm hot and cold at the same moment but not at the same time.
I'm number three.
But I'm not a number.

Who or what am I?