>Our original ancestors from Adam and Eve to Noah were much smarter, healthier, stronger, etc. Many of them lived for several hundred years. They were corrupted by sin, just as we are, but their diet, environment, etc were much better.
When death came by sin it started a constant deterioration of human bodies. Being closer to the beginning their deterioration took longer, they remained physically healthy for longer. They weren't as much living longer as they were deteriorating slower.
Now, 7,000 years later, we are a deteriorating copy of a copy of a copy of a copy. We are deteriorating fast and speeding up.
Sin isn't just banging your neighbors wife, it is a disease on our bodies.