I'm not a millennial, but it makes a heck of a lot of financial sense to live with family. I'm glad that with these shifts, the stigma is falling away. My immediate family has lived through rough times, with lots of "creative" living arrangements. Of course, we should still train general life autonomy, and not promote being able-but-incapable shut-ins, but being able to venture into housing (or back out of it if thin…
I've heard that in (at least some regions of) Spain, it's perfectly common and acceptable to continue living with their parents well into adulthood. I remember reading that José María Olazábal (one of the best professional golfers in the 90's, with millions of dollars in earnings) was still living with his parents into his early 40's (though to be fair, he was traveling for half the year on tour). I often think that…
Look at how Harry Truman lived. My uncles all lived at home until they moved, either for military service or because they got married. Age range roughly 1915 to around 1945 or so.
People lived in boarding houses if they didn't have a family.
My sister has a "boomerang" Millenial; the house is probably 3-4000 sq feet and the "kids suite" upstairs is probably 1200 sq ft. or so.