How old is the earth?
The first chapter of Genesis describes the creation of the earth as a six day time period. Some people read this portion of the Bible literally and others read it literarily, believing that the six days were actually representative of at least a thousand years. This allows for some people to account for the evolution theory. Because there are so many different interpretations of scripture and whether or not to read this section of it literally, as well as there not being a clear cut answer in scripture saying how old the earth is, the answer would simply be speculation depending on your own interpretation of scripture.