Father can you tell me a story?

Of course my son what would you like to hear?
One that many don’t know; one of time and how it came to be.
I say that one even I don’t know, but I know one of a man not like you or I he was six foot two with long white hair.
Six foot two with long white hair?
Yes my son.
Was he very old?
No one knows his true age but it’s said that he carried a glass as tall as he filled with sand.
Why?
No one knows for sure but they say if he was to stand next to a man and the glass was have full the man would look and feel as young as you, but if the glass was empty the man would fall asleep forever and never to awake.
This can’t be true!
Why my son?
No No not you
Not wha………