This has nothing to do with broken money.
This is their culture.
Go read a book dude.
Discussion
I don't need to go read a book. I'm Spanish and this is my culture.
I lived with my parents while studying at the university. And when I got my first job at age 24 I moved out to my own place (rental).
This study accounts for this cultural preference. That is why it breaks down the statistics by age.
And when those between the ages of 30 and 34 are asked why they still live with their parents, "lack of own income is cited as being of high or very high importance by 66.3% of young Spaniards, 62.4% of Portuguese and 61.2% of Italians.".
You should read the report. It's very interesting.
It would be true if... they were getting married at 21 and living in extended families until their parents pass on. That's the traditional culture. It's not traditional culture to be unemployed from 16-34, living at home and surviving on not even the parents low income, but on the grandparents more generous pension.
So Jandro is correct here.