The researchers found a correlation between how much caffeine the women typically drank (which was mostly from coffee) when they were between 45 and 60 years old and their likelihood of healthy aging. After adjusting for other factors that could affect aging, such as their overall diet, how much they exercised and whether they smoked, those who consumed the most caffeine (equivalent to nearly seven eight-ounce cups of coffee per day) had odds of healthy aging that were 13 percent higher than those who consumed the least caffeine (equivalent to less than one cup per day).