A new type of age ‘clock’ can assess chronic inflammation to predict whether someone is at risk of developing age-related disorders such as cardiovascular and neurodegenerative disease. The clock measures ‘biological age’, which takes health into consideration and can be higher or lower than a person’s chronological age.
To develop iAge, a team including systems biologist David Furman and vascular specialist Nazish Sayed at Stanford University in California analysed blood samples from 1,001 people aged 8–96 who are part of the 1000 Immunomes Project, which aims to investigate how signatures of chronic, systemic inflammation change as people age. The researchers used the participants’ chronological ages and health information, combined with a machine-learning algorithm, to identify the protein markers in blood that most clearly signal systemic inflammation.
After developing it, the researchers tested iAge by collecting the blood of 19 people who had lived to at least 99 years old, and using the tool to calculate their biological age. On average, the centenarians had an iAge 40 years lower than their actual age, according to a press release — aligning with the idea that people with healthier immune systems tend to live longer.