And others were so genetically youthful they appeared to be in their 20s.
Researcher Dr Eileen Crimmins, professor of gerontology at the University of Southern California, said: “Some people who are 57 or older look like they’re in their twenties, while some people look like they’re over 100, and there’s a big range in between.
“We think that adverse social experiences can change your epigenetic profile in ways that may subsequently influence your health adversely.
“There were people who looked 36 years younger, while some look 48 years older.”
Epigenetics involves the study of age-related changes linked to methylation, the process in which DNA becomes disrupted over time.