More than you might think, according to a study in the journal Plastic and Reconstructive Surgery.
By Jenny Bailly
Nature vs. Nurture: The Beauty Edition
A panel of four judges analyzed photographs of 186 identical twins and estimated their ages. Since the duos share exactly the same genetic material, differences in how old they appear can be attributed to their individual behaviors and experiences, says the study's lead author, Bahman Guyuron, MD, chair of the department of plastic surgery at University Hospitals Case Western Reserve University in Cleveland. Here's what the study found .