What am I?

I walk without standing
I float and yet I sink
I am old yet still a boy
Pass me on the left
Pass me on the right
But never the same both ways
You'll never find me on land
But in truth I have no sea legs either


This riddle copywright to SoS piracy 29/2/06

Song snippets

How does your heart beat?
Why do you breath?

He's insane, truely mental and sometimes I fear it's rubbing off on me

It's clouds illusions I recall
I really don't know clouds at all