Sadly over the past few decades a divide has taken place in evangelical circles around the subject of when the universe was created. What’s even more unfortunate is the type of language used to defend either view. There’s a kind of mud slinging that goes on and as Christians we should rise above that type of attitude.
For example, according to Ken Ham from Answers in Genesis, “Believing in a relatively ‘young earth’ (i.e., only a few thousands of years old, which we accept) is a consequence of accepting the authority of the Word of God as an infallible revelation from our omniscient Creator.” 
In other words if you don’t believe in a young earth then you must believe that the Word of God is fallible. This would be passionately denied by many old earth creationists.
Seven days that divide the world
One proponent of a possible old earth view is John Lennox, a professor of mathematics and a fellow in the philosophy of science at Oxford University. Lennox is well known to many assembly believers having spoken at various assembly conferences. His book Seven Days That Divide the World: The Beginning According to Genesis and Science deals with his views on the topic.
Reading through this book it’s easy to see that Lennox is a very smart guy. His arguments are well thought through, and he uses Scripture to back many of his claims. I have seen many videos of Lennox debating atheists and talking about the defense of the faith and a striking quality is his humility and grace. This also comes through in the book. He’s not out to attack other views, but he humbly shares his own.
The danger of scientific theology
He starts his book by expressing his concern about tying theology to science. He makes a strong case that it’s better to get our theology right first before trying to state how science fits in. Science changes and so does our understanding of the universe. Our beliefs should not fall just because we understand science differently.
He states, “The major thrust of my argument so far, then, is that there is a way of understanding Genesis 1 that does not compromise the authority and primacy of Scripture and that, at the same time, takes into account our increased knowledge of the universe, as Scripture itself suggests we should (Rom. 1:19-20).” [page 64]
Sin before the fall?
One of the main views of young earth creationists is that it’s impossible for there to be any death before the fall of Adam. Quoting Ken Ham again, “I’m a revelationist, no-death-before-Adam redemptionist!” Lennox offers a different view, and I found this section one of the most fascinating in the book.
He gives various arguments as to why death did occur before sin. He makes it clear that death of humans did not happen until Adam sinned but describes how other forms of death were taking place. He also spends some time talking about the effect of Satan in the garden, a creature who had already sinned.
Am I a young earth creationist or an old earth creationist? At this point I’m still searching. Lennox offers credible views and from a brilliant man it’s not hard to sit back and give it attention. I highly recommend this book, for at the very least it will stimulate your thinking and sharpen your thoughts.