Published in the 1993 in the book Nightmares And Dreamscapes

This story is about a grandfather giving advice to his grandson about time...pretty pony time.

An interesting story, and so true.  I can say the part about being a child and an adult is true...not sure about the old person part yet...still got a few years in me til I would call myself old...but no doubt I will find out.
to Stephen King - Books