Forget the face lift and push aside the anti-ageing creams - all you need to do is smile.
A study found that the simple act of smiling takes years off a person's age.
The German researchers say that it is likely we consider people who are happy as being attractive in other ways – including being younger than they actually are.
Manuel Voelkle, of the Max Planck Institute in Berlin, asked more than 150 men and women of different ages to judge the ages of the faces in more than 1,000 photographs.
He concluded: 'Facial expressions has a substantial impact on accuracy.
'Relative to other facial expressions, the age of neutral faces was estimated most accurately, while the ages of those displaying happy expressions was most likely under-estimated.'
The study also revealed the older faces to be more difficult to judge than the younger ones.
The age of those doing the judging was also important.
In general, older people overestimated the age of those photographed, while younger people shaved a year or two off.
Women also fared better, with older female faces estimated on average to be three years younger than their male equivalent, the journal Psychology and Aging reports.
Previous research has shown with plump cheeks and soft features making women appear younger. The effect is so strong that the loss of just 10lb in weight - around a dress size - can age a woman by some four years.
Don't judge a life by one difficult season. There was a man who had four sons. He wanted his sons to learn to not judge things too quickly. So he sent them each on a quest, in tur