My parent 's house was built in 1988, a few years before I was born. Lived in it for 19 years.
My house was built 1973 and I've lived in it the past 3 years.
My apartment I have no clue but I've been living there the past 2 years during the fall and spring semesters.
Not sure about my family's lakehouse. I'd have to say 60s-70s because that's when people started to build summer homes and vacation on that lake.