Scarlett Johansson has a full pout and so does Angelina JolieUnilever researcher David Gunn has identified women who look young for their age as having thin lips.  Genetically determined, lips mature at their fullest in young adulthood. They are also easy to measure.

Even with a few wrinkles or grey hairs, a ‘plump pout’ can take years off a woman, according to Gunn, who studied over 250 women, many twins.