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

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

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. 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?

Chhote se Chintu Miyan,
Lambi si Pooch.
Jahan Jaye Chintu Miyan,
Wahan Jaye Pooch.

छोटे से चींटू मियाँ,
लंबी सी पूंछ।
जहाँ जाये चींटू मियाँ,
वहाँ जाये पूंछ।

Bolo kya?

What is full of holes but still holds water?

Two in a corner, one in a room, zero in a house, but one in a shelter. 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?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

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