When you live with another person for 50 years, all of your memories are invested in that person, like a bank account of shared memories. Its not that you refer to them constantly. In fact, for people who do not live in the past, you almost never say, Do you remember that night we...? But you dont have to. That is the best of all. You know that the other person does remember. Thus, the past is part of the present as long as the other person lives. It is better than any scrapbook, because you are both living scrapbooks.