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by seaknoll 1097 days ago
The images are of various ages. This article describes the subset that are the oldest, but there are newer ones mixed in. In some places you get layers of them, where you can see that the older ones were drawn over. They can estimate how much later they were added based on the presence of animals and objects that did not exist there 12,000 years ago.

It's true that there's a huge gap in time between the earliest paintings and the newer ones and so some aspects of the culture probably did change. But the area has been continuously populated for millennia.