Answer:
I'm tall when I'm young and short when I'm old. What am I?
When I come in from sea to shore twenty paces you'll see No less no more.
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I turn around once. What is out will not get in. I turn around again. What is in will not get out.
I'm found on Windows yet I am just a decoration. What am I?
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?