Finally, a simple method to looking younger that doesn't cost you a cent, a new study suggests that by simply showing off your pearly whites and looking happy, you have a greater chance of people underestimating your age.
The study conducted by the Max Planck Institute for Human Development in Berlin, found that the age of a person with a neutral facial expression is most accurately identified, possibly why we are told not to smile for passport photos. But that it is much harder to read the age of faces that have an emotional expression, with people smiling the most likely to be underestimated.