5. Milkman
There was a time when the refrigerator was not common. A lot of people depended on the milkman for their daily need of calcium. Nearly 30% of American households were greeting the milkman every morning in 1963, according to The New York Times. That percentage shrunk to 0.5% by 2005.
The milkman, however, is not totally vanished. People can still sign up for companies that deliver milk to your home. But for that, you’d have to pay a lot more than what you usually pay for milk at the grocery stores. At this point, it looks like home milk delivery will only remain a niche service, a very tiny number of people actually remember the milkman.