Conclusion: Paedocommunion is alien yesterday, today, and for ever
Before the fall, only adults had access to manducate of the fruit of the tree of life. After the fall, only adults had access to manducate at the Passover – and at the Lord’s Supper which replaced it. And in glory, where all of God’s elect shall be resurrected precisely as adults – only adults shall have access to manducate of the fruit of the tree of life on the New Earth and in the City of God, Who has always been mature.
Yes, God was always mature. In the beginning, as His images, He created but one elect and mature human pair. That pair, in its descendants, throughout history unfolds into an elect mature humanity. That, during history, grows from babyhood through adolescence unto maturity. But after its consummation, though yet aging, elect humanity never grows senile.