Accelerated Biological Aging May Contribute to Rising Rates of Early-Onset Cancer
More recent generations of adults may be biologically older than their parents were at the same chronological age, according to new research linking accelerated biological aging to rising rates of early-onset cancer. The findings suggest that changes in the modern environment and lifestyle may be accelerating age-related biological processes and increasing the risk of cancer at younger ages.
The study, led by researchers at Washington University School of Medicine in St. Louis, found that younger generations appear to carry a greater burden of biological aging than previous generations. Accelerated biological aging may partly explain why cancers that traditionally occurred in older adults are increasingly being diagnosed before the age of 55.
What Biological Age Measures
Biological age reflects the functional state of the body rather than the number of years a person has lived. Unlike chronological age, it estimates the cumulative effects of inflammation, metabolic health, environmental exposures, and lifestyle factors on tissues and organs.
To assess biological aging, the researchers used Phenotypic Age (PhenoAge), a validated biomarker-based measure that combines chronological age with nine clinical blood biomarkers, including C-reactive protein (CRP), glucose, creatinine, albumin, lymphocyte percentage, mean cell volume, red cell distribution width, alkaline phosphatase, and white blood cell count. They then calculated an age acceleration (age gap) score, indicating whether an individual's biological age was older or younger than expected for their chronological age.
Younger Generations Show Faster Biological Aging
The investigators analyzed health and laboratory data from 154,169 participants in the UK Biobank and 10,262 participants in the U.S. All of Us Research Program. Participants were grouped according to birth decade, allowing biological aging to be compared across generations at similar chronological ages.
In the UK Biobank, individuals born between 1965 and 1974 had a 23% higher standardized biological age gap than those born between 1950 and 1954. In the U.S. cohort, adults born during the 1990s had a 92% higher age gap than those born between 1965 and 1969, suggesting substantially faster biological aging in more recent generations.
Association With Early-Onset Cancer
Using participants with long-term follow-up, the researchers investigated whether accelerated biological aging was associated with early-onset cancer, defined as cancer diagnosed before the age of 55. The analysis focused on solid malignancies affecting organs and tissues.
Each one-standard-deviation increase in biological age acceleration was associated with an 8% higher risk of developing an early-onset solid cancer. The association was strongest for cancers of the lung, digestive system, and uterus, all of which have shown increasing incidence among younger adults in recent decades.
Lung and Colorectal Cancer Show Distinct Patterns
The strongest association was observed for lung cancer. Individuals with greater biological age acceleration had a 57% higher risk of developing early-onset lung cancer. Importantly, this association remained significant after adjustment for smoking status, obesity, genetic susceptibility, and telomere length.
Additional analyses suggested that different biological aging mechanisms may contribute to different cancer types. Proteomic signatures of immune system aging were more strongly associated with early-onset lung cancer, whereas accelerated adipose tissue aging showed a stronger association with early-onset colorectal cancer.
The Role of Modern Environmental Factors
The researchers emphasize that accelerated biological aging is unlikely to be explained by a single factor. Instead, they propose that a combination of modern lifestyle and environmental influences—including unhealthy dietary patterns, physical inactivity, obesity, environmental pollution, chronic psychological stress, and sleep disruption—may collectively accelerate biological aging.
Understanding how these exposures become biologically embedded could shift cancer prevention toward more personalized strategies. Measuring biological age may eventually help identify younger adults at higher risk, allowing earlier screening and preventive interventions.
Public Health Implications
The findings do not suggest that all younger adults are destined to develop cancer early. Rather, they indicate a concerning population-level trend in which younger generations appear to exhibit older biological profiles than previous generations at the same chronological age. If confirmed, this shift could contribute to increasing rates of chronic diseases beyond cancer in the coming decades.
The authors suggest that the results support earlier implementation of healthy lifestyle interventions, improved access to preventive healthcare, and reconsideration of screening strategies for selected early-onset cancers. Future studies will seek to identify which environmental and behavioral factors have the greatest influence on biological aging and whether modifying these factors can reduce cancer risk.
The study, published in Nature Medicine, contributes to a growing body of evidence seeking to explain the global rise in early-onset cancers. Although many questions remain unanswered, the findings suggest that accelerated biological aging may represent an important mechanistic link between modern environmental exposures and increasing cancer incidence among younger adults.
