I grew up part of a family of 7 in a 3 bedroom row house. My first sister was born when I was 15 months old, and she and I shared a room till I left home at 19. I didn’t get a room of my own till I got my first apartment at 21. My husband was one of 3 sons, and when they were small, their dad combined 2 bedrooms into one, setting it up like a dorm room for the 3 boys.
As I think back, most of my friends were onlies or had just one sibling, so they pretty much all had rooms to themselves - oh how I envied them!! But I know other of my contemporaries shared bedrooms.
From my days of wasting time with HGTV porn, homebuyers seem to be obsessed with a room for each kid, plus a spare guest room. On the very rare occasions when we had company, we ended up on the sofa bed in the basement and our guests got our bedrooms.
Did you share a room as a kid? Do your kids share a room? Did any of your friends have to share bedrooms? If you could give your age and where you live(d), that would be interesting for me to know too.