The more you take, the more you leave behind. What am I?

What has many keys, but can't even open a single door?

Poor people have it. Rich people need it. If you eat it you die. What is it?

If you have me, you want to share me. If you share me, you haven't got me. What am I?

How can you make seven even?

I'm tall when I'm young and I'm short when I'm old. What am I?

What travels around the world but stays in one spot?

What is so delicate that saying its name breaks it?

What has hands but can not clap?

I am free yet priceless, you can't own me but you can use me, you can't keep me but you can spend me. Once you lost me you can never have me back. What am I?