Some ancient flint tools held by the British Museum have recently been dated to be 560,000 years old, although labelled as the oldest I would be cautions in accepting that, other flint handaxes have been given older dates, but perhaps these are the oldest dates acquired by scientific testing. Source article.
What is more interesting is that at least one of them has a rotational face profile stack, this is something I discovered and have regularly mentioned on my forum, blog and other social media. The face stack has the ubiquitous gorilla face profile, combined with a partial human face, and at least one other ape face profile. I will dig out a very similar communication device later to share here that replicates this example. The face stack can be seen in the raised area of the handaxe, left. To the right we also have another one of my figurative symbolic discoveries, the hand, the finger complete with finger nail feature can be seen along the top for the find pointing to the left, the thumb pointing downwards as in my chart, and previously documented by myself in my own finds, African handaxes, and various other world wide stone artefacts. I don't expect people who are unskilled in Palaeolithic art and symbology to accept what I can see, in the same way as I cannot speak or read Japanese.