I don't think you asked me before...and I don't know. How long were Adam and Eve in the Garden before they messed up and brought death into the world? Was Adam's age figured from his creation, or from the day death entered the world...the date he actually started to age? When people lived 1000 years, how old were they before they had kids? Was a generation 20 years, or not?
Now a question for you...humans have been hanging around this world for something like 95,000 years, according to your beliefs. Why did we do absolutely nothing for 90,000 of those years, and then suddenly invent civilization, cities, writing, etc. etc.? Is this really a plausible theory, given what we know about humans?
Agriculture. Until the advent of agriculture large scale civilization was impossible. You just can't get enough food to feed 10,000 people by simply hunting the passing herds.

Take a look at that chart. Over the last 100,000 years, CO2 levels where pretty low relatively speaking. A large amount of the gas was trapped in the continent spanning glaciers. You see that about the end of that ice age, there was a massive rise in the CO2 levels. That was due to the ice melting, and the CO2 being released into the atmosphere.
Now, it's widely accepted scientific fact that higher CO2 levels are required for large scale agriculture to take place. A silver lining to AGW was that more food would be able to be grown to support the worlds population. So prior to the melting of these ice caps humanity was unable to sustain and feed a large population like it can today. They had to devote a massive amount of time to hunting and gathering, which restricted the amount of time they had to advancing in things like arts and sciences.
We can support this by looking at the fossil record of humanity and it's ancestors. Each successive species of humanity had a larger brain, and was more capable of complex thought. Each successive species of humanity exhibited more and more ability to "invent", there by making food easier to get, and being able to devote more time to expanding things like language, art, clothing, etc...
So, once that CO2 was released, we where able to start cultivating crops, and planting them in large scale quantities. Humanity was able to settle down in one place now, since it was no longer a slave to the moving herds. Since they had to devote less time to getting that food because one person could now provide what 20 people used to be able to provide, more and more people where able to devote their spare time to "inventing" society.
This is why I laugh at people who hate global warming. None of us would be alive today if it where not for global warming. Humanity would still be largely hunting and gathering groups, with our population reaching no more then a couple million world wide.