Adam and Eve were perfect.
When they sinned, they not only lost their perfection, they no longer could have perfect children
Romans 5:12 tells us "through one man, sin entered the world, and death through sin, and death spread to all men, because all sinned."
And 1 Corinthians 15:26 tells of the time when "the last enemy, death, is to be brought to nothing."
So the "good news" is that we were not designed to live for a few years, then die. And John 5:28-29 assures us that all in the past who have lived and died without ever knowing the truth about God and the "good news" about his purpose will live again and have a chance to gain the life Adam lost.
I don't know about you, but the prospect of welcoming back my parents, hiking with my dad - and his father's dad is one of the very pleasant prospects I look forward to.