Wow what a fantastic walk that must have been. That olive tree looks absolutely ancient. So your post motivated me to do some checking. I found a photo of a similar olive tree in Crete and it has this note:

This ancient olive tree is located on the Greek island of Crete and is one of seven olive trees in the Mediterranean believed to be at least 2,000 to 3,000 years old. Although its exact age cannot be verified, the Olive Tree of Vouves might be the oldest among them, estimated at over 3,000 years old. It still produces olives, and they are highly prized. Olive trees are hardy and drought-, disease- and fire-resistant — part of the reason for their longevity and their widespread use in the region.

Nature is just amazing :-)

Source:
https://www.mnn.com/earth-matters/wilderness-resources/photos/the-worlds-10-oldest-living-trees/olive-tree-of-vouves