I'd like to see some paper/book about 'But people have been happily "making it work", across cultures, for centuries.', proving that the majority of couples we

I'd like to see some paper/book about 'But people have been happily "making it work", across cultures, for centuries.', proving that the majority of couples were happy in their golden years. But we should start defining golden years because in many civilizations and ages, lifespan was certainly shorter on average. Edit: typo