This is an interesting subject. I have discussions with friend who is a historian/archeologist and she calls these 'inconvenient dates' as she has found and held artifacts from the middle east dating from 14,000 years ago. At the time all I could think of was that the materials that these were made of were very old,but not necssearily made into bowls etc until much later. I was much into the 4000BC thing until I spoke to her,she isn't a dub,but she did get me thinking.
I know the earth itself is,could be,billions of years old,but did Jehovah experiment first with 'cavemen' before creating Adam? Were dinosaurs precursers for things like elephants,crocs etc?
Like to know your thoughts.