In Italy it's fairly common to live with parents until you find a partner. Housing prices are really high, income is low and having an housemate without romantic engagement is not a common practice, unless you're studying in another city.

IE, I'm almost 30 and I've been living alone for 2 years only because I found a decent medium-pay stable job 3.5 years ago, and the apartment I live in is rented by a friend who asks very little money. All of my friends who are single like me live with their parents, and only a few of those who are engaged live with their partners.