It is always ahead of me yet I can never see it. What is it?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

What is both possible and impossible at the same time?

John was so frustrated to be the suspect of being a sleeper terrorist that he shoot himself right between the eyes with a revolver in his toilet. The revolver and the bullets were accurate. Minutes later John walks out of the toilet unharmed.
How can this be possible?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

On a bus, there is a 26-year-old pregnant lady.
A 30-year-old policeman.
A 52-year-old random woman.
And the 65-year-old driver.

Who is the youngest?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?