What do day-age theorists do with "very good" in Genesis 1:31? I would like to know what day-age theorists do with what God says at the end of creation - that everything was "very good" (Genesis 1:31)?  That is to say, if you look at the fossil record, you see death, disease, cancer, killing, etc.  So how could God say at the end of creation that everything that He had made was very good?
The best way for me to answer this as a Day Age person is to quote from my main go to guy on the topic, Hugh Ross so I'm going to quote from one of his articles.

Was Evil Present in God's Very Good World

If you read the full article you will notice that Ross shows that the Bible uses the words Good and very good in both a moral sense, as well as in the sense of beauty and aesthetics.


  Interpreting tob in Genesis 1
  Tob carries both a moral and a physical appraisal in Genesis 1—the former based on supplementary information in Genesis 3, and the latter on the verb "saw." Hence the essential question is how to weigh these two components: is the meaning more moral than physical, or the reverse? Those who believe that the moral component dominates will typically suggest that God's creation contained not only no real evil, but also no apparent evil. Such interpreters usually picture the original creation as being like the popular concept of "Nirvana"—with no vertebrate animal death or harsh conditions whatsoever. There are, however, severe problems with this interpretation, detailed in our previous TNRTB, "What Does a 'Very Good' World Look Like?" (see here and here.)
  On the other hand, a strong argument can be made that the good God sees in Genesis 1 refers to the aesthetic and/or functional beauty of His creation. This is not to deny the moral aspect of the word tob in Genesis 1, but to emphasize the pleasing sight that God beheld in His work. There is harmony and structure in the creation narrative that points to the harmony and structure of the cosmos. Furthermore, His laws of nature are working together, and something that works harmoniously is beautiful to behold. Additionally, God may have seen Earth as tob because of its potential as humanity's habitat and the place where humans fellowship with the Creator.
  
  Our belief is that the language of Genesis 1 fits better with the aesthetic/functional interpretation. Although it is true that no real evil was present in the original creation, that is not the primary emphasis. Instead, the primary emphasis rests on the beauty of the created order. This is in harmony with the language and biblical theology (Psa. 104; Rev. 4:11). By contrast, there seems little justification for those who claim there is no apparent evil in the created order.
  If we combine the aesthetic and functional concepts of beauty with the moral, one can see why God sees His creation as very good.