I don’t wade into the Old Earth Creation (OEC) vs. Young Earth Creation (YEC) debate, mostly because I am not heavily involved in science nor am I involved in scientific apologetics. This post is not intended to reverse this trend. However, from time to time I notice arguments on the side of the YEC and the OEC that should be addressed, because they are either fallacious or not as powerful as the proponent thinks they are.
The argument in question goes as follows. If YEC is true, then the universe is far younger than it appears (i.e., than the evidence from science would indicate). If this is true, then God is a deceiver (alternatively, it violates God’s omnibenevolence), since he makes something appear to be the case when it is not (alternatively, God’s omnibenevolence would not allow him to make it the case that we are deceived when using our rational faculties in science appropriately). God is not a deceiver (alternatively, God is omnibenevolent). Therefore, YEC is false.
I think we have a clear counterexample to this primary suggestion. Consider the biblical account of Adam. Suppose you, having no knowledge of the biblical record, are sent back in time to the point of the creation of Adam (whenever that may have been). You wander through the garden (which, unbeknownst to you, is actually the Garden of Eden) and find a man. “Hello,” you say. “Hello,” he replies. “My name’s Adam.” By the looks of it, you figure the man to be 25 to 30 years of age. Being quite a forward fellow, you ask him, “So…how old are you?” (You never were good at “the social skills”!) Adam replies, “Oh, God made me about three days ago.”
Who should think that therefore God is a deceiver, to let you believe, using your rational faculties appropriately, that Adam was far older than he actually was?! Surely no one would think that (nor should they). In the end, OEC may triumph over YEC, but it will be due to other arguments and considerations, not this one.
 Clearly what I am about to suggest only functions as a counterexample for those who believe in a literal Adam (whether OEC or YEC). But I happen to think that constitutes the vast majority of evangelical Christianity, and so the vast majority of OEC proponents as well.
 This is just a thought experiment; we’re simply pretending he can understand you and vice versa.