A study showed the ease with which we can find how old someone looks, and it is by viewing the contrast between facial features and surrounding skin.
Psychology Professor Richard Russell said that the contrast between the features and the surrounding skin reduces as we catch up with age. It is often easy to spot older faces as they have less contrast as compared to younger ones.
During a study, Russell discovered that the ageing process also changes the color of the lips, eyes and eyebrows. The skin just happens to get darker. This causes reduced contrast between the features and the surrounding skin, giving an appearance of older faces.
It is perhaps for this reason that the cosmetic industry uses contrasting colors to enhance beauty which makes the person appear younger.