This is something I personally would not get caught in.
God made the world in six days and rested on the seventh. According time lines given in the bible, the earth isn't more than about 7 thousand years old. Also, God clearly says "And there was evening and there was morning, the ___ day." meaning the days are the same then as they are now.
A few TE's take the creation account as an historical record of events (though, they take it very differently from the modern literal interpretation), but most take it as figurative -- under the belief that God did not intend to give us an historical account of creation, but to use figure to tell us something about Himself, about us, and about how we relate to Him.
There are also other errors if you attempt to mix evolution with creation. One error is that according to evolution, there is information being added to the DNA structure in order to create changes in the organism.
I would recommend not using this argument against evolution. It isn't correct. Evolution doesn't say that information (in a technical sense) is being added. There were some mathematicians at one time who posited that evolution was contradicted by information theory. The problem was that there was no reliable way to apply "information" (as a technical word, not as an intuitive thing) that showed it increasing.
I know that it _looks_ to the casual observer like a human has "more information" than a human-like ancestor, but that is only because when you think of the word "information" you are using some intuitive notion of what information is. Unfortunately, information theory has its own definition of "information" that isn't so easily applied.
This verse indicates that nothing new is coming in, and that nothing changes that incredibly. Also, there really isn't a single example of information being "naturally" added to an organism to improve it. There are examples of when you take away or change information, but not when it comes to adding information.
The verse is actually not referring to DNA or evolution. The author is talking about the things that people do and how pointless they are. He begins his talk with "Vanity of vanities!, says the Teacher. Vanity of vanities! All is vanity." (NRSV) He is saying that human pursuits are pointless, in themselves. He sees the same things happen over and over again in the world and he is despairing of the point of it all.
There is a much more important spiritual lesson in Ecclesiastes than a trite refute of evolution. The modern literal interpretation of Genesis (as distinct from literal interpretations more than 150 or so years ago) are so overly obsessed with evolution that (in my opinion) they abuse Scripture. Be careful. Creationist teachers will point out the vast number of passages that oppose evolution, and in so doing remove their real value. Consider: suppose evolution disappeared tomorrow; I think that in the eyes of creationists there would be large amounts of Scripture that would cease to be useful.
Another thing is, evolution indicates that we are improving or becoming better. I disagree with this. There are ancient structures such as the pyramids and also ancient objects such as glass skulls where we have no idea how they were able to create them. There are also records of Ancient Egyptians having electricity, plumbing and medicines. Evolution indicates that people were stupid then and are getting smarter, and even though when we compare ourselves over the past few hundred years we are more advanced, we cannot do many of the things ancients were able to. Thus, even though we may be smart, they were probably smarter.
Evolution does not say we (or anything else) is becoming better, generally. It says that we (as a population) are becoming better at propagating our genes. Evolution does not say that people were stupid a few thousand years ago. Evolution is a very gradual process and humans have very long generations (as compared with many other species).
The ancients were probably not smarter than us. They were probably about the same. Technology is not a good indicator of how intelligent one society is as compared with another. This is the mistake a lot of people make in saying that we are smarter (e.g., putting a man on the moon, electronics, the combustion engine, etc.). But it is not so. We don't say that Americans are smarter than tribesmen with no connection to the rest of the world. Nor do we say that they are smarter.
Also, in biblical times people lived much longer. Hundreds of years in many cases. As time went on, these time periods became shorter and shorter. Back then they were able to live several hundred years and yet we have no knowledge of them having super advanced medical facilities or magic youth pills. They simply lived longer. This time period became the shortest in the middle ages when the average life span was between 30 and 40 years of age. However with the advancements of recent technology we've been able to survive until about 70-80 years of age on average. Still with the advancement of our technology we are not living nearly as long as they did then. I believe this to be a result of sin loss or incorrect sequences in the genetic codes. Imagine a document being copied over and over and over again. Things are missed, they fade or disappear. DNA copies itself from generation to generation, nothing is ever added and eventually the mistakes in it are causing our lives to become shorter. The mistakes in the code are causing more genetic, incurable problems and also leaving more weakness' for disease which is why at one point humans were only living on average to the age of 40. As much as we hate to admit it, we're getting worse, not better. God made us perfect in the beginning, and because of sin we are deteriorating continually.
The entrance of sin into the world didn't change our DNA or the chemical processes used to copy it. The ages of the people in the lineages were symbolic, not literal. The decrease in ages is intended to communicate a gradual falling away from the image of God. But the degree to which one reflects the image of God is not an indicator of how long someone will live, literally speaking.
