When we look at photos from the distant past, they tend to commemorate the more significant moments of history. Although it's not exactly impossible to find fairly mundane photos dating back to even the early days of the 20th century, the fact remains that there was a lot more incentive to pick the right moment to take a picture in the old days.
After all, cameras were not only nowhere near as portable as they are now, but the process of taking a picture and actually seeing it was a lot more involved and took much longer than it does now. So unless your lunch was something you came across once in a blue moon, you weren't likely to take a picture of it.
However, enough pictures of the more everyday aspects of people's lives exist to tell us that although the levels of technology we enjoy and the pop culture we like may differ, the way that we live our lives every day isn't so different from our ancestors.
And that gives these pictures a familiar, almost comforting feeling.