Can you find the missing piece of the Porsche?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

How many sides does a circle have?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?