In their study, researchers looked at identical twins as they are genetically programmed to age exactly the same and discovered that, when it comes to one's face, it's possible to cheat one's biological clock.

"A person's heritage may initially dictate how they age – but if you introduce certain factors into your life, you will certainly age faster. Likewise, if you avoid those factors you can slow down the hands of time," said lead author Bahaman Guyuron of University Hospitals Case Medical Centre.

In fact, during the study, Guyuron and his colleagues obtained comprehensive questionnaires and digital images from 186 pairs of identical twins. The images were then reviewed by an independent panel which subsequently recorded the perceived age difference between the siblings.

The findings revealed that twins who had been divorced appeared nearly two years older than their siblings who were married, single or even widowed. Anti-depressant use was also associated with a significantly older appearance and weight played a major factor too.

In those sets of twins, who were less than 40 years old, the heavier twin was perceived as being older, while in those groups over 40 years old, the heavier twin appeared younger, the researchers found.

"This research is important for two reasons. First, we have discovered a number of new factors that contribute to aging and second, our findings put science behind the idea that volume replacement rejuvenates the face," Guyuron said.