You purport to be a literalist, but you make it up as you go. Here are 100 years old sinners in your millennium and you do not know what to do with them because you want your millennium to be sinless and devoid of sinners. So, you explain them away. How convenient! Amils see billions of sinners in their millennium.
They are dead. They are not living in dead flesh. Adam lived in death. No one lives in death in the Millennium. That is the error of your own Millennium. You claim the 1000 years in Revelation is something it is not.
No one in the Millennium is born a sinner. They disobey one time and are then dead. The verse just points out after 100, the point of disobedience is no longer an issue. Because one is still growing out of childhood into becoming an adult at 100.
"There shall be no more thence an infant of days, nor an old man that hath not filled his days: for the child shall die an hundred years old; but the sinner being an hundred years old shall be accursed."
This verse does not say 100 is an old age. In fact it says there are no old humans period. This verse does not say every child will die when they turn 100. Death is the result of disobedience to God. Always has been. No verse declares any one who is disobedient, gets to keep living in sin and death.
Obviously you don't see the literal point, as you see figurative language, and fill in the blanks with your own made up explanation that eternity means no one dies. You put sin into eternity in your interpretation. The word sinner is in the verse.
Remember the iron rod rule, where death is the outcome of sin and sinners. If as you yourself admit disobedience is sin, the first act of disobedience is instant death. There is no intermediate living on earth in death as a sinner. A dead sinner is no longer on the earth, but placed in death, with no redemption available. Breaking a law shows that you are not looking for redemption, but death. Just living in the Millennium guarantees everlasting life, as long as you never disobey.
It is not my Millennium. It is called the Day of the Lord. I don't want anything. I am just pointing out what the Word of God states. Amil can keep on making outrageous claims all they want. It will not change anything.