During the Old Stone Age, humans were primarily nomadic, moving from place to place in search of food and shelter. They relied on hunting and gathering to obtain their sustenance and did not engage in agriculture or animal domestication. As a result, the early cities were not permanent settlements and were often abandoned when resources in the area were depleted.
It's important to note that the concept of "cities" as we understand them today did not exist in the Old Stone Age. The term "city" typically refers to a large and densely populated urban center with various social, economic, and cultural institutions. These characteristics were not present in the early settlements of the Paleolithic era.