I find this data very suspect. Greece is one of the poorer countries in the EU and somehow it takes fewer generations than far more rich countries like France and Germany? The only thing that makes sense is that they mention the mean salary, so Greek wages are so low that you don’t need much to get up into the mean salary range, I guess.
Doesn’t make it any less cool, but this is a false color composite image make from a bunch of shots stitched together.