I see Adam long years having to do with his relationship with God, before and yes even after the fall; remember Adam is a son of God I am sure this glory was passed down to the generations until God’s purposes were compete, then God put and end to the long years.
The following was written by George Hawtin: No corrupt and dying blood flowed in the veins of these inhabitants of Paradise. No death-dealing carnal mind corrupted them to bring their members under the power of death and sin. They lived in a realm long since closed to the human race. They were clothed upon not with garments of wool and cotton or even seamless robes, but, because of their heavenly brightness and their blessed communion with God, they lived in a realm of transfiguration and were no more in need of earthly garments than an angel. All creatures of that perfumed, effulgent paradise were under their wise and loving control. No timid creature raced in terror from snarling ravenous beasts. The pitiful cry of a dying thing was never heard. Peace reigned supreme and love without alloy. Had this blessed son in his unfallen state walked the earth centuries later, he, too, would have stilled the waves, raised the dead, and healed diseases as did Christ, the last Adam. But this was not God's plan.
Adam and Eve were both…NAKED! Among all the creatures which God made, man stands out unique…stark naked…which means devoid of true wisdom and knowledge, with his inner nature revealed, opened up, exhibited, and made bare. Oh, that God may give us understanding to see that to be naked means to have THE FLESH UNCOVERED AND EXPOSED! In the typology of scripture "the flesh" is the name by which the Holy Spirit designates our outer life of soul and body, our earthly and carnal human nature, literally speaking of that nature which is earthly minded, with its lusts and self-centeredness, its ego and I-will which are in rebellion to the spirit. Thus, the flesh is not the outward, visible man of meat, muscle, and bones, but the nature of the soulical and bodily man. This nature was in man from the beginning, else Eve (who was of the man) could not have been tempted, nor could they have sinned! This nature could be seen to be in them from the time God lowered them out of their pure spirit existence, in the image and likeness of God, investing them with a body of earth so that man became a living soul. But as long as man was caught up in God he was not aware of it — for he was naked and was not ashamed (Gen. 2:25). Have we not all experienced the same thing?