A new study that tested the biological ages of 1,000 38-year-old showed a range from 30 to 60. The researchers tested things like lung function, HDL cholesterol, and cognitive function, among many other conditions believed to be associated with aging.

Some volunteers had biologically aged two or three years over the course of one chronological year. Those that showed signs of accelerated aging also looked older, according to the Duke undergraduates that guessed their ages from their pictures.

Researches hope that by studying aging in younger subjects, they will come closer to fighting diseases and complications that can be life threatening later in life.

Cover image: Flickr