This is an interesting hypothesis, but it does have problems.
Again, I ask you if you are willing to reconsider your convictions on this?
I ask because if you are not willing, then we are both wasting our time discussing, and your hypothesis is not really other than a gut feeling of truth. Fair enough?
* Maybe I'm wrong, but the subject of aging seems like a red herring to the questions I posed above.
I'll address it, although I don't see the subject of aging relevant.
You say "Nowhere in the Bible you can find a direct link between sin and aging"…
— About Abraham, in Genesis 25:8 it says: “He took his last breath and died at a ripe old age, old and contented, and he was gathered to his people”
Abraham died at the recorded age of 175; Adam at 930… so let's think about that.
How is aging not clearly implied in the process of death by sin?
You say "nowhere in the Bible you find God promising Adam and Eve that they would live forever on earth."
— If I tell you that you will not eat if you do not accomplish a certain task, am I not implying that you will eat if you obey? Do you need to read expressly that God promised everlasting life? Does not Jesus' words in John 17:3 confirm that everlasting life was the idea all along?