As Kevin Anchukaitis put it, the Tree Rings’ Tale told by the olive tree is “Really really really really really really hard” to read. From Cherubini et al:

Dendrochronological analyses of olive trees growing on the Aegean island Santorini (Greece) show that the determination of the number of tree-rings is impossible because of intra-annual wood density fluctuations, variability in tree-ring boundary structure, and restriction of its cambial activity to shifting sectors of the circumference, causing the tree-ring sequences along radii of the same cross section to differ.

We will have to leave the olive tree to literary dating:

Good morrow, fair ones: pray you, if you know,

Where in the purlieus of this forest stands

A sheep-cote fenced about with olive trees?