One study surveyed more than 520,000 people in 10 European countries, making it the largest study to date on coffee and mortality, and found that drinking more coffee could significantly lower a person's risk of mortality.
The second study was more novel, as it focused on nonwhite populations. After surveying over 185,000 African-Americans, Native Americans, Hawaiians, Japanese-Americans, Latinos and whites, the researchers found that coffee increases longevity across various races.
It's from the typical association studies using statistical methods and surveys. I wouldn't put too much faith in the results. I'd like to see what other factors were involved besides just coffee. Correlation does not equal causation.
People who drank two to four cups a day had an 18% lower risk of death compared with people who did not drink coffee
I'm pretty sure everyone has the same risk of death. 100%
I know the risk of death for people around me goes down when I drink coffee.