Biological age predicts death risk after surgery
Two people of the same age can be worlds apart biologically. A new multi-cohort study suggests that difference matters most when the body is under surgical stress.
Researchers examined whether biological age clocks could better predict postoperative mortality and complications than chronological age alone. Using PhenoAge, a clock that estimates biological age from blood biomarkers, the study found that accelerated biological aging correlates with significantly higher mortality risk following major surgery in older adults.
When your birthday is not the right measure
Surgeons currently rely heavily on chronological age to gauge operative risk. But age on a birth certificate is a crude proxy. PhenoAge acceleration refers to the gap between a person’s biological age estimate and their calendar age. In this study, that gap was a stronger predictor of poor surgical outcomes than calendar age alone. Two patients both aged seventy may differ dramatically in their capacity to recover from the physiological stress of an operation.
The findings fit a wider pattern in longevity research: biological age clocks do not measure how long someone has lived, but how much cumulative damage their body has accumulated. That damage determines resilience under acute stress, and major surgery is precisely such a stressor.
Towards better risk assessment
The researchers suggest that blood-based aging clocks could assist in difficult clinical decisions, such as whether a frail older patient should undergo a high-risk procedure. These are correlational findings, and the authors do not propose the clock as a sole criterion. Still, the prospect of a simple blood test providing more meaningful risk information than a birth year offers a promising direction for surgical risk assessment. Further validation across diverse hospital settings and populations will be needed before clinical adoption.
Search terms to explore further: PhenoAge biological aging, postoperative mortality risk, physiological resilience aging