Caveasaurus Combat goes back at least 160,000 to 180,000 years and possibly further if it was actually developed by pre Homosaipen humans (Neanderthal, Cromagnon etc...).
Modern man emerged roughly 180,000 to 200,000 years ago depending on what archaeological source you are siting. Pre Homosaipien humans actually go back several millions of years though, and Cavesaurus Combat may very well be that old.
Also, some version or another of the 3 original empty hand techniques exists in just about every art, proving they all descended from Cavasaurus Combat; thus proving it is the undisputed original martial art style.
You just cannot beat that type of authenticity.