Study: stress, not just genetics add years to face

"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 study author Bahaman Guyuron, an American Society of Plastic Surgeons (ASPS) member.

Researchers examined 186 pairs of identical twins because "they are genetically programmed to age exactly the same," explained Guyuron, professor and chairman of the department of plastic surgery at the University Hospitals Case Medical Center, in Cleveland, Ohio.

The study found that twins who had been divorced looked nearly two years older than their identical siblings who were married, widowed or single. Researchers found that antidepressant use and weight gain were also factors in perceived age difference.