Answer:
What is it that no man ever saw, which never was, but always will be?
A gentleman whose offspring have successfully produced offspring of their own.
I travel the world and I am drunk constantly. Who am I?
It goes up and down the stairs without moving.
You can draw me, fire me or fill me in.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.