What is the Biblical evidence against the day-age theory? As many of you probably know, the day-age theory is an attempt to reconcile creation and evolution, by turning the days mentioned in Genesis into long periods of time. What is the biblical evidence against this theory? How can I use Scripture to refute such a view?
The primary argument against the day age theory is from the Hebrew Grammer.  The word Yom is translated day in this passage, and in different contexts it can mean different things.  


In 67 verses in the Old Testament, the word Yom is translated into the English word "time." (Genesis 4:3, I Kings 11:42)
Four times in the Old Testament Yom is translated "year." (1 Kings 1:1) 
Eight times in the Old Testament Yom is translated "age." (Genesis 18:11 and 24:1, Joshua 23:1)
It is translated Day hundreds of times.


If we were to stop here in our investigation of the word we could conclude that the genesis account could include the idea of the word yom referring to an age instead of a literal day.  But as we dig deeper this view becomes less likely.

Every place we find the word Yom with the words morning or evening it always means a literal 24 hour day.  Every place we find the word Yom with a number (First Day for example) it always means a literal day.  So usage would tell us that when we find the words "So the evening and the morning were the first day." we would fully expect that this means a literal day and not an age.