I shave every day, but my beard stays the same. What am I?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

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

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?