How can I make my life expectancy longer?
Limitation of studies
But let's take a step back and consider that while this study offered us an idea, it was observational and just because there is a correlation between coffee consumption and longevity, it doesn't mean that coffee is the only reason or cause for that.
Studies like these take into account multiple factors, but cannot yet determine causality, which means that coffee may not have been what caused certain populations to improve longevity.