How long have people been cultivating olives?

The olive was first domesticated in the Eastern Mediterranean between 8,000 and 6,000 years ago, The findings, published  in the journal Proceedings of the Royal Society B, are based on the genetic analysis of nearly 1,900 samples from around the Mediterranean Sea. The study reveals that domesticated olives, which are larger and juicier than wild varieties, were probably first cultivated from wild olive trees at the frontier between Turkey and Syria.

Source: https://www.livescience.com/26887-olive-tree-origins.html