“For the young man will die at 100 years old.” There will be natural people in Christ’s Millennial Kingdom on earth, but they will live a long time, as this verse says. If a person dies at 100 years old they will still be considered as dying young. Isaiah 65:22 says the natural people in the Millennial Kingdom will live as long as trees, which could easily be several hundred years.
After Christ conquers the earth in the Battle of Armageddon (Rev. 19:11-21), he will gather the people who survive the battle and divide them into two groups, the “sheep” and the “goats.” The goats are immediately thrown into the Lake of Fire, while the “sheep” are let into the Millennial Kingdom (Matt. 25:31-46). The natural people who are allowed into the Millennial Kingdom at the Sheep and Goat judgment will have never experienced death, and so they will marry, bear children (Isa. 65:20, 23; Ezek. 47:22), age and die (Isa. 65:20), just as people do on earth now. It is some of those people who Satan will deceive when he is let out of the Abyss at the end of the 1,000-year Millennial Kingdom (Rev. 20:1-3, 7-10). Christ’s Millennial Kingdom on earth will be a time of unprecedented safety and health, and the children will grow up healthy and safe.
[For more on the Sheep and Goat Judgment and natural people being let into Christ’s Millennial Kingdom, see commentary on Matt. 25:32. For more on the Millennial Kingdom and the future reign of Christ on earth, see Appendix 3, “Christ’s Future Kingdom on Earth.” For more on the future resurrections, the resurrection of the righteous and the resurrection of the unrighteous, see commentary on Acts 24:15].