What Am I Riddles

a couple (medium)

Question: There is a couple that is always together. They go anywhere they want to go. They can't be separated. No one can touch them. They are the size of a ping pong ball. What is it?

What am I? (medium)

Question: What is often picked but seldom chosen, never walks but can run when frozen?

Question: I am a small room,
but no life lives inside,
no matter what weather looms,
very cold my residents reside.
What am I?

Question: I have no wallet but I pay my way.I travel the world but in the corner I stay.

What am I?

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?