Secrets of the Centenarians: How Swiss Study Unlocks the Biology of Exceptional Longevity
In Switzerland, only 0.02% of the population surpasses the age of 100. This rarity has prompted researchers to investigate whether those reaching this milestone possess unique biological characteristics. The SWISS100 project, the first large-scale Swiss research effort dedicated to centenarians, is beginning to reveal answers.
Unveiling the Molecular Signatures of Longevity
Researchers from the University of Geneva (UNIGE) and the University of Lausanne (UNIL) compared blood profiles of centenarians with those of individuals in their 80s and adults aged 30 to 60. The study, published in the journal Aging Cell, identified 37 proteins whose profiles in centenarians appear linked to slower aging.1
Centenarians Exhibit “Younger” Blood Profiles
Across these 37 proteins, centenarians demonstrated profiles surprisingly similar to those of younger individuals, particularly regarding markers of oxidative stress. According to Flavien Delhaes, a researcher at UNIGE, the profiles of these proteins are “closer to those of the youngest group than to those of octogenarians.”1 This suggests that centenarians don’t necessarily avoid aging altogether, but certain biological processes appear to slow down.
Reduced Oxidative Stress: A Key Finding
The most consistent differences observed involved proteins linked to oxidative stress, a process driven by free radicals and believed to accelerate aging. Centenarians exhibited notably lower levels of five proteins associated with oxidative stress. Surprisingly, they also had significantly lower levels of antioxidant proteins compared to typical older adults.3
Karl-Heinz Krause, professor emeritus at UNIGE’s Faculty of Medicine, explained this counterintuitive finding: “Centenarians have significantly lower levels of antioxidant proteins than the standard geriatric population…it indicates that since oxidative stress levels are significantly lower in our centenarians, they have less need to produce antioxidant proteins to defend against it.”1
Beyond Oxidative Stress: Inflammation and Tissue Maintenance
The study also highlighted proteins involved in regulating the extracellular matrix – the structural framework of tissues. Some of these proteins showed expression levels in centenarians closer to those of younger adults. Signals related to potential tumor protection were identified, though further research is needed to confirm this.3
Inflammation and metabolism also differed in centenarians. Increases in proteins involved in fat metabolism, typically seen with age, were more muted in the centenarian group. Levels of interleukin-1 alpha, a major inflammatory protein, were also lower.3
Metabolic Stability and Insulin Regulation
Researchers found that levels of DPP-4, a protein that breaks down GLP-1 (a hormone boosting insulin secretion), remained well-preserved in centenarians. This could contribute to metabolic stability by maintaining relatively low insulin levels, potentially protecting against metabolic syndrome.1
The SWISS100 Study: A Multi-Disciplinary Approach
Led by Daniela Jopp, a professor at UNIL, the SWISS100 study combines sociology, psychology, medicine, and biology to understand exceptional longevity.1 Data collection for the study concluded in 2025.1
Implications and Future Research
Researchers emphasize that this work is not a “longevity recipe,” but rather a map of biological processes that may slow down aging. The findings could inform therapies aimed at reducing frailty in older adults. They also highlight the importance of lifestyle factors, estimating that genetics accounts for only about 25% of longevity, leaving room for nutrition, physical activity, and social connection to play a significant role.1