Compared with people who reported drinking no coffee, those reporting 3-4 cups per day had longer telomeres, while those reporting 5 or more cups per day did not show the same association.
Guzzling coffee is not a new habit. In fact, Americans have loved coffeehouses since the 19th century. The 1940s was a particularly good time for coffee, with Americans drinking more than 46 gallons each every year (per the USDA). Consumption has dropped since then, but the truth remains that most Americans can't get through the day without a cup of coffee.