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

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

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

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

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. 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?

What am I?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
also make u smile and blush ☺️
What am I?

I am first found in caves, now prolific online; I am a depiction, a drawing, a symbol, or sign. I will convey whichever mood you could wish; or for that matter, a fist, flask, or fish. What am I?