The appearance of age theory states that the universe was created to look as if it is old (the universe looks like it is 12-17 billion years old). This theory is used by young earth creationists to keep their belief looking somewhat reasonable. However, while the theory is usually used to prove the universe is between 6000 to 50000 years old, it can also be used equally to prove that the universe was created last Tuesday.

While this theory may be true, it is unscientific because there really is no way to prove it false. Those creationists who reject this theory are known as old earth creationists. A Biblical basis for rejecting appearance of age is to look at the character of God. Would God create a Universe which both "declares his glory", yet at the same time deceives scientists into seeing the Universe as billions of years old?