Just a random discovery on the internet:
I was inclined not to believe this, but according to Mental Floss:
The concept of sliced bread first came about thanks to Otto Rohwedder, an American inventor from Iowa. Rohwedder constructed the first loaf-at-a-time bread-slicing machine for commercial use, but initially had some trouble selling it, or even the idea of it; many bakers expressed concerns about the bread becoming stale too quickly or simply falling apart if sliced.
At first, to combat the worry of the bread quickly going stale, Rohwedder recommended the use of pins to hold the bread together after slicing. Since removing pins to get a slice of bread was inconvenient, Rohwedder soon amended his packaging plan: The loaves of sliced bread were to be wrapped in thick wax paper immediately after being sliced, to keep them fresh. Despite these ideas, bakers were still convinced that customers wouldn’t care whether or not their bread was sliced.
But the Chillicothe Baking Company, in Chillicothe, Missouri, was willing to give Rohwedder’s invention a chance. They installed the machine and began to sell “Kleen Maid Sliced Bread” on July 7, 1928.
Oh, and Betty White just turned 94 this past Jan. 17. So she’s older than sliced bread. By at least six years.