Answer:
I'm tall when I'm young and short when I'm old. What am I?
I have all the knowledge you have. But I am so small that I can fit into your hands. What am I?
I'm really blue but when you see me I'm red. You don't see me too often. I'm there for you if you're hurt.
What goes through towns and over hills but never moves?
What word sounds the same even after you take away four of its five letters?
Strip the skin under my skin, and my flesh you'll reveal. It tastes sweet and tart, now throw out the peel. What is it?