This poem is called "The Invitation". It was written by Oriah Mountain Dreamer. Her first name coming to her in a dream and Mountain Dreamer given to her by a Shamanic Healer. She is not an Indian Elder nor is she an American Indian.
It's the oldest story in the world. One day you're seventeen and planning for someday, and then quietly, without you ever really noticing, someday is today, and that someday is yesterday and this is your life. -Nathan Scott one tree hill:)