I believe in a young earth.
Here is what a friend of mine wrote. He also addresses the original poster's question.
The group he is associate director for, also has an article on this topic, it can be found
here.
I hope these two pages help.
well I for one don't accept his premisses. He is just making assumptions on the basis of his own presuppositions and reading in what he has been brought up to believe. There are clear indications in Genesis 1 that the yom are not natural days and nights. The very description evening and morning is very strange, especially as in Gen 1 Yom 1 HAS NO EVENING. It commences with total darkness,
Besides evening and morning is NOT a 24 hour day. it leaves out night time and afternoon. It is therefore more natural to see it as indicating beginning (morning) and ending (evening), especially as in Genesis 1 'yom' is defined as indicating a period of light.
Furthermore 24 hour days could not naturally be seen as commencing before the fourth yom. So the natural interpretation is to see the yoms as 'days of God'.
Thus in my view the idea of a 6 24 hour day creation IS NOT the natural interpretation of the passage, especially as we note that the seventh yom has no evening and morning, and is not said to end. And this is especially so as it is clear that the account has been built up on a very careful pattern to show preparation and completion
this should at least indicate to us that if we take the literal Hebrew it is open to question precisely what the account is saying. There is no one view that dots all the i's and crosses all the t's. we should therefore beware of slanging those who disagree with us.