63.5% of Greeks between ages 18 and 34 live at home with their parents.

And over half of those between the ages of 25 and 34 live at home. These numbers have gone up since 2010.
"Moving out of the house you grew up in is a rite of passage," Bloomberg reporters Flavia Krause-Jackson and Giovanni Salzano write. "Moving back in with your parents is a cry for help. In Greece, it's come to just that."
Source: Bloomberg