Answer:
I am all around, yet to me you are half blind. Sunlight makes me invisible and difficult to find. What am I?
When you take away the whole from me, there is always some left. What am I?
I'm tall when I'm young and I'm short when I'm old. What am I?
Four leaves I have.
I am tomorrow's yesterday and yesterday's tomorrow. What am I?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?