Those do seem like pretty good clues! "... we could have cats" is adorable.

My parents married in 1965. My mom was 23 and my dad was 28, back from getting his PhD. So not as late as your parents, but my mom did say she was considered an old maid at that point. And I (eldest) wasn't born until 4 years after that. For me it's more the feeling in the house that came to mind, than any specific stories. And my own bumpy history with relationships. They did have two double beds next to each other, instead of one big bed.