Here is what John Ankerberg has to say:
This thread is not intended to debate the differences, it is to identify the areas of agreement between the two positions.Areas of Agreement Between Young- and Old-Earth Creationists
Young- and old-earth creationists have much in common, at least among those who are evangelical. This includes several basic things.
Direct Supernatural Creation of All Forms of Life
Both young- and old-earthers believe that God supernaturally, directly and immediately produced every kind of animal and human as separate and genetically distinct forms of life. Both hold that every kind produced by God was directly created de nova (brand-new) and did not come about by God's using natural processes over a long period of time or tinkering with previous types of life in order to make higher forms (evolution).
Opposition to Naturalism
Both groups are also agreed in their opposition to naturalism, which they see as the philosophical presupposition of evolution. They correctly observe that without a naturalistic bias, evolution loses its credibility. Ruling out the possibility of supernatural intervention in the world begs the whole question in favor of evolution even before one begins.
Opposition to Macroevolution
Likewise, both are united in their opposition to macroevolution, either theistic or nontheistic; that is, they reject the theory of common ancestry. They both deny that all forms of life descended by completely natural processes without supernatural intervention from the outside. They deny that all living things are like a tree connected to a common trunk and root; rather, they affirm the separate ancestry of all the basic forms of life, a picture more like a forest of different trees. Microevolution, where small changes occur within the basic kinds of created things, is acknowledged, but no macro (large-scale) evolution occurs between different kinds. For example, both old- and young-earth creationists agree that all dogs are related to an original canine pair—part of the same tree. However, they deny that dogs, cats, cows, and other created kinds are related like branches from one original tree.
The Historicity of the Genesis Account
Further, both young- and old-earthers who are evangelical hold to the historicity of the Genesis account: They believe that Adam and Eve were literal people, the progenitors of the entire human race. While some may allow for poetic form and figure of speech in the narrative, all agree that it conveys historical and literal truth about origins. This is made clear by the New Testament references to Adam and Eve, their creation and fall, as literal (cf. Luke 3:38; Rom. 5:12; 1 Tim. 2:13-14).
Please add yours.