If everlasting life really had been in store for Adam and Eve don't you think it would've been the first thing God would've told them they'd forfeited after eating the fruit?
Details like the ground being harder to work and less productive, the newly introduced pain into childbirth and the dominance of a husband over his wife are all a bit grim but you'd think losing immortality might at least get a mention.
Truth is that living forever was never held out as a prospect to these adult children. It was only ever mentioned in a private conversation amongst the gods afterwards as something to be withheld.
Like the Truman Show.