There are benefits that apply to the brain, liver and bones – with studies suggesting that up to five cups per day is the ideal dose. But fascinatingly, experts now believe those benefits may differ, depending on our age. Here, experts reveal the ideal amount of coffee to drink at every stage of life. Scientists believe coffee's protective power comes from compounds known as polyphenols, which help reduce inflammation and oxidative stress throughout the body. Those who drink at least two cups of coffee from the age of 40 onwards have also been shown to have more muscle mass than non-drinkers in later life.