Wow. This is great. Wonderful contributions.
If you've started looking you're half way there. In truth there is no one purpose of life. Life is life, a lion doesn't live with the same purpose as a sheep!

Your purpose and reasoning for life is as much your own as it is mine. We are all different, different skills, minds, pasts, presents, and futures.

Don't look at someone who makes a lot of money and say “that is the purpose”, don't look at someone who helps children and say “that is the purpose”, don't look at someone who fights and say “that is the purpose.”.

Look at yourself, ernhestly and ask what you love to do, why you love to do it, and how you're going to do it. Your purpose is to find those exact answers. Your purpose is to discover who you are as a person.