Answer:
The more you take the more you leave behind. What am I?
There was a girl half my age when I was 12, now I am 66, how old is she?
What always goes to bed with its shoes on?
What can travel all around the world without leaving its corner?
I only exist when you are here. Where you never were I can never be.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.