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

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

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

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

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

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

You see me once in June, twice in November, and not at all in May. What am I?

I add 5 to 9 and get 2. The answer is correct, so what am I?

I am an eight letter word and I am a computer terminology.
The second, third and fourth letters make an animal.
The fourth, fifth, sixth, seventh and eighth letters make a weapon.
The first, second, third and fourth letters can be taken as an outcome of any exam.
The fifth, sixth, seventh and eighth letter combine to form a high end typing software.

Can you tell who am I ?

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