At one time, they were thought to be roughly 2000 years old. At 7,000–8,000 years old, they predate the domestication of camels (so far as we know):
Their age makes them even older than such ancient landmarks as Stonehenge (5,000 years old) or the Pyramids at Giza (4,500 years old). They even predate the domestication of camels, a catalyst for economic development in the region.
At the time of their creation, Saudi Arabia looked very different, with plains of grass dotted with lakes rather than the deserts of today.
It is not clear why the camel sculptures were created, but the researchers have suggested that they could have provided a meeting point for nomadic tribes.
News, “Saudi Arabia camel carvings dated to prehistoric era” at BBC News (September 15, 2021)
Ancient people get smarter every time we run into them.
You may also wish to read: World’s oldest art raises question: Is it art? Researchers would not be asking if it is art if it were not so old (between 169,000 and 226,000). The underlying assumption seems to be that humans did not think imaginatively in those days. The evidence seems to contradict the evolutionary assumption.