Kay Star - My Parents were Witnesses when I was growing up. I kept the Watchtower Society's Literature and New Releases over the Years from which I found the Answers to the following Questions about Youth Restoration. See the Quotes from the Society's Literature.

Q. When did the Millennial Reign Begin?
A.  Watchtower October 15, 1990 article "Be Thankful - Jehovah's Messianic Kingdom Rules":
"In October 1914, Jehovah God set his beloved Son, the Lord Jesus Christ, on the throne in the heavenly Kingdom...What Glorious News this is and what Reason for the Greatest Happiness."
   Jesus began ruling "in the midst of his enemies". Psalms 110:2

Q. How will Youth Restoration Happen?
A. Book, "Revelation - It's Grand Climax at Hand" (1988) Chapter 19:
"...John has just mentioned other scrolls that will be opened during the Millennial Reign. What will these be?...Evidently, then, the publishing of these scrolls will publish Jehovah's detailed Requirements for Mankind during the thousand years.
   By Applying In Their Lives the Regulations (Restrictions/Diet)...Obedient Humans will be able to Lengthen their Days, attaining finally to Everlasting Life."

Q. Will Youth Restoration be Gradual or Quick?
A. Book, "Life - How Did it Get Here? By Evolution or by Creation?" (1985) Chapter 19:
    "The Aged will Gradually Return to the perfect Manhood and Womanhood that Adam and Eve enjoyed in Eden.
   This Process will be one of the Results of the "Re-Creation" (Regeneration) about which Jesus spoke". - Matthew 19:28

Q. What are The Creators Diet Instructions, given in the Garden of Eden?
A. "...Vegetation...Fruit to You let it serve as Food". Genesis 1:29
    "...take Eat and Live to Time Indefinite." Genesis 3:22 New World Translation
    "...take Eat and Live Forever." Genesis 3:22 New International Version

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Timeline - Youth Restored by Following The Creators "Garden" Diet Instructions

1912 - Arnold Ehret, Diet Researcher in Germany
          Author, "The Fundamental Cause of Growing Old and Ugly" (1912)
         "Mucusless Diet Healing System" (1922)
  
Published his Diet Discovery that certain Foods (Animal Products, Oils, Grain Products) were the Cause of Sickness and Looking Old. After People made a *Change in Diet* to Eating only Fruit, Greens and Vegetables (The Creators "Garden of Eden" Diet Instructions) their Body then *Restored Itself* to Looking Young again!

   Arnold Ehret: "For Thousands of Years, Humanity has Indulged in Dreams and Wishful Thinking about the Fountain of Youth...I have Seen People who became so Rejuvenated and Beautiful after a Mucusless Diet Cure (Eating only Fruit, Greens and Vegetables) that I almost didn't Recognize them."

1939 - Jethro Kloss, Diet Researcher in Wisconsin, USA
          Author, "Back to Eden"