What does below Rebus mean ?

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The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Name a key which is hardest to turn.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

I have eight fingers and two thumbs but I do not live. What Am I?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

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