JRand: I guess Peter Filichia didn't get the word about your production. Here's what he wrote today about "Never Too Late":
Why wasn’t she doing it before? Because, you infer, she had a job. No. Edith is -- and Kate is too, as the song goes in Working -- “Just a housewife.” All right, Edith comes from the generation where that was a woman’s career, but we have less understanding even in 1962 why a young woman like Kate wouldn’t go to work given that she doesn’t have a house of her own to keep. And what young married couple today could bear to live with parents? Here’s a play whose time has definitely passed.
And in this paragraph, Filichia seems to be a bit out of touch: More and more young couples are, in fact, living with their parents (one set or the other). The economy, the (still-)overpriced housing market (home owners will disagree, natch), the difficult job market all contribute to newlyweds needing to find a price break on living and many find it "at home" with the folks.
I don't suggest he's wrong overall...but in Asian and Latino communities in California, there are more instances of young folks living with the parental units. And those communities are LARGE out here. The differences, of course, are that everyone works.
I don't think the concept has passed at all. It's only passé in certain demographic groups.